Overview
Product Catalog Inventory Management in 3Dsellers lets you update inventory quantities using two main methods:
Bulk updates directly in the interface
CSV imports for larger updates or external inventory files
The Multichannel Inventory Management system tracks inventory by SKU, helping maintain accurate stock across eBay accounts and other selling channels.
To avoid overselling and keep listings accurate, it’s important to understand both update methods and how Inventory Sync Settings by Channel affect inventory updates.
Accessing Multichannel Inventory Management
Log in to your 3Dsellers account.
In the left sidebar, go to Products Catalog.
Click Inventory Management.
The Multichannel Inventory Management page displays products by SKU, inventory by warehouse, and sync status by selling channel.
Understanding the Inventory Management Interface
Key features
Product list: SKUs, images, and current inventory
Warehouse info: which warehouse is assigned to each product
Inventory metrics: On Hand / Available / Reserved
Sync channels: which marketplaces/accounts are synced for each product
Bulk selection: select multiple products for bulk actions
Search and filters: find products quickly by SKU and filters
Table columns
Checkbox: select products for bulk operations
Image: product thumbnail
Items: SKU and identification
Warehouse: warehouse assignment
On Hand: total physical inventory (editable with pencil icon)
Available: available for sale (On Hand minus Reserved)
Reserved: reserved for pending orders
Sync Channels: Shows where the product is listed across your connected channels
Empty if the product is not listed on any channel
Displays listing status (for example: Live or Pending)
Shows whether a listing has errors
Indicates the linking status between the catalog product and the listing
Method 1: Bulk Update Inventory
Bulk update is best for quick changes to a selected group of products.
Step 1: Select products
In Inventory Management, use search or filters to find the products.
Select products using the checkboxes.
(Optional) Use Select all to select all visible products.
Confirm the message: “X items are selected.”
Step 2: Open the bulk update modal
Click Update Inventory in the action bar.
The Set Warehouse Inventory modal opens.
Step 3: Configure warehouse and quantity
In the Set Warehouse Inventory modal:
Select warehouse
Choose a warehouse from the dropdown.
The selected warehouse is applied to all selected products.
If a product already has a warehouse assigned, it will be updated.
Set quantity
Choose one update method:
Set Quantity to: replaces all selected products with the exact value
Increase quantity by: adds a value to the current quantity of each product
Include variations
Enable Include variations to update variation inventory for selected products.
Step 4: Execute update
Review your selections.
Click Update.
Wait for the confirmation message.
Step 5: Verify results
After the update completes:
Confirm how many products were updated
Check inventory values in the table
Confirm warehouse assignments
Verify sync channels reflect the update (if sync is enabled)
Important notes about bulk updates
Warehouse assignment: applies the selected warehouse to all selected products (overwrites previous warehouse assignments)
Quantity overwrite: “Set Quantity to” replaces existing quantities
Variations: updating variations may affect multiple variation rows/listings
Sync behavior: inventory updates sync based on your Inventory Sync Settings by Channel
Method 2: Update Inventory with CSV File
CSV updates are best for large inventory updates (50+ products), inventory counts, or importing inventory from external systems.
Step 1: Prepare your CSV file
Required columns
sku(required)quantity(required)warehouse(optional but recommended for multi-warehouse setups)
Example CSV format
sku,quantity,warehouse PROD-001,50,Karol_Warehouse PROD-002,30,Karol_Warehouse PROD-003,25,Lake_Mary_Florida_Warehouse VAR-001,100,Karol_Warehouse
CSV requirements
Save as .csv with UTF-8 encoding
First row must contain column headers
SKUs must match catalog SKUs exactly
Quantity must be numeric (0 or positive integers)
Warehouse names must match existing warehouses exactly
Step 2: Access CSV import
You can start a CSV inventory update in either location:
Option A: Inventory Management
Click Update Inventory with CSV in the action bar.
Option B: Import/Export Files
Go to Products Catalog > Import/Export Files
Select Update Inventory from the import options.
Step 3: Upload your CSV file
Click Choose File / Browse / Upload.
Select your CSV file.
The system begins processing.
Step 4: Map CSV columns (Inventory CSV mapping)
After upload, you’ll reach the Mapping screen. This step controls how each CSV column updates inventory.
What to do
Confirm SKU is mapped correctly (required).
Map your CSV quantity column to the quantity field.
(Optional) Map warehouse if included in your CSV.
Leave fields as Don’t import if you do not want them updated.
(Optional) Save the mapping using a Mapping Preset to reuse later.
Click Start Import (or Import/Confirm) to run the update.
Step 5: Verify results
After import completes:
Review the summary (how many updated / any errors)
Confirm quantities updated in the inventory table
Verify warehouse assignments
Confirm sync channels reflect updated inventory (if sync is enabled)
Scheduled CSV Imports (Beta)
If you need automated inventory updates:
Go to Products Catalog > Import/Export Files
Open Scheduled (Beta)
Create a schedule to import CSV files from a URL or FTP
Set frequency (e.g., every 3 hours, daily)
Set the action to Update Inventory
Enable or disable the schedule as needed
Inventory Sync Settings by Channel
These settings control how inventory changes sync between 3Dsellers and your connected channels (eBay accounts, etc.). Proper configuration helps prevent overselling.
Accessing sync settings
In Inventory Management, click Inventory Sync Setting by Channel.
The modal opens showing connected channels and sync status (ON/OFF).
Editing channel sync settings
In the sync settings modal, click Edit Settings for a channel.
2. Configure the sync sections below.
3. Click Save.
Channel settings explained
Section 1: Price Sync
Controls whether catalog price changes update linked listings on the channel.
Options
Don’t update the products price on [Channel Name]
Update the products price on [Channel Name]
Tip: You can also adjust pricing using Mapping Template rules (increase/decrease/round/end in .99, etc.).
Section 2: Inventory Updates from Products Changes
Controls whether inventory changes in 3Dsellers update linked listings on the channel.
Options
Don’t update the products quantity on [Channel Name]
Update the products quantity on [Channel Name]
Note: After turning this ON, 3Dsellers will update quantity only after a new action occurs (CSV, bulk update, manual change, or order received).
Section 3: Inventory Updates from Received Orders
Controls whether imported orders reduce inventory in 3Dsellers automatically. When you choose to update the product quantity on 3Dsellers, two more switches appear: Update inventory for Active / Not yet Paid orders (reduces the quantity as soon as the order is placed, before the buyer pays) and Restock inventory after return (adds the returned quantity back once the return is completed). See Restock Inventory After eBay and Shopify Returns.
Options
Don’t update the product quantity on 3Dsellers
Update the product quantity on 3Dsellers
How sync settings affect inventory updates
If “Inventory Updates from Products Changes” is ON
Bulk updates sync to channel
CSV imports sync to channel
Manual edits sync to channel
Order-based changes sync to channel
If “Inventory Updates from Products Changes” is OFF
Inventory changes in 3Dsellers do not update channel listings automatically
If “Inventory Updates from Received Orders” is ON
Orders reduce inventory in 3Dsellers automatically
Helps prevent overselling when listed on multiple channels
If “Inventory Updates from Received Orders” is OFF
Orders do not affect 3Dsellers inventory automatically
You must manage decreases manually
Best practices for inventory updates
Choosing the right method
Use Bulk Update for:
quick updates to a small set of products (10–50)
setting the same quantity for multiple products
increasing quantities by a fixed amount
assigning products to a warehouse
Use CSV Update for:
large updates (50+ products)
physical inventory counts
external inventory systems
scheduled/automated updates
different quantities per SKU
Before updating
Review channel sync settings
Export inventory data as backup if making major changes
Verify SKUs and warehouse names
Test with a small batch first (5–10 products)
After updating
Verify a sample of products
Monitor sync and confirm listings reflect updates
Save logs/records for reconciliation
Troubleshooting
Bulk update not working
Confirm products are selected
Verify warehouse exists
Validate quantity values
Try a smaller batch
CSV import fails or shows errors
Confirm file is CSV + UTF-8
Check headers:
sku,quantity,warehouseConfirm SKUs match exactly (no spaces, typos, casing issues)
Confirm quantity is numeric and non-negative
Confirm warehouse names match exactly
Inventory not syncing to channels
Ensure “Inventory Updates from Products Changes” is ON for that channel
Verify channel connection is active
Confirm products are linked to listings (if required)
Allow time for sync to complete
Orders not updating inventory
Ensure “Inventory Updates from Received Orders” is ON
Confirm orders are importing into 3Dsellers
Confirm SKUs match catalog SKUs
Warehouse not appearing
Confirm warehouse exists in Products Catalog > Warehouses
Ensure it’s active
Refresh the page
Quantities not updating correctly
Confirm whether you used “Set Quantity to” vs “Increase quantity by”
Double-check CSV values
Check if another process is updating inventory at the same time
Review sync behavior
Important notes and limitations
Bulk updates apply the selected warehouse to all selected products
Very large CSV files may need splitting into smaller batches
Quantities must be non-negative integers
CSV warehouse names must match existing warehouses exactly
Some sync functions require products linked to listings
Orders affect inventory only if orders are imported and order-sync is enabled