To update inventory in batch, you can:

• update a inventory file exported (please skip step 3)
• download a template for input, then import

1. go to 'Seller Center > Inventory'

2.click 'Create > Import' from top right hand corner

3. click download icon to download template

4. fill in the template, and save in Excel file format

5. Click 'Choose File' and select the file 

6. Click 'Confirm'

7. Check if the status is 'completed'

You may also want to know:

• how to export inventory in batch 
• how to update inventory of a product