To update your item quantities using a downloadable spreadsheet:

1. Sign in to your Yahoo! Store account.
2. Click the "Catalog Manager" link in the "Edit" section of your Store Manager page.
3. Click the "Track Your Inventory" link.
4. Click [Download Inventory] to download a spreadsheet containing your current item quantities.
5. Select the table whose item quantities you would like to download.
6. Click [Download].
7. Open the downloaded spreadsheet file using spreadsheet software like Microsoft Excel.
8. Make whatever revisions you like to your item quantities.
9. Return to the "Track Your Inventory" page.
10. Click [Upload Inventory] to upload your revised inventory spreadsheet.
11. Select the table to which you would like to upload your spreadsheet and click "Browse..." to locate the spreadsheet file on your computer.
12. Click [Upload].

Note: Changes you make to your item quantities using Catalog Manager are reflected on your site immediately. There's no need to publish your catalog for your inventory changes to take effect.