To help buyers find an item you’re listing for sale on eBay, correctly categorizing the item is key. Often items will sell for less than market price because they’re listed in sub-optimal categories. And while many buyers discover items to purchase by using keyword search, many use the Browse feature (found at the top of nearly every page on eBay.com). This is particularly true for unusual items, items that don’t have brand names associated with them, and so forth.
There are more than 45,000 product categories on eBay, and new subcategories are being added all the time. It shouldn’t be difficult to find one that applies to your item, but what happens if the thing you’re selling could be put in two categories? We can make this happen for you — it’s absolutely possible to list your item in two categories simultaneously. You can do this even if you’ve already listed an item by using the Revise Your Item form. Here’s a walkthrough:
1. Make sure you’re logged in to eBay with the user ID you used to list the item.
2. Go to the page for your listing and click on the “Revise your item” link.

3. The rules for revising items are displayed. It’s always OK to add a second category or add features such as boldface or subtitles, but there are rules regarding changes in the description of the item and so forth — those don’t apply here, so click on the Continue button.
4. Click on the “Add second Category” link about halfway down the page on the right.

5. You’ll be taken to familiar six-deep category selection page similar to the one you used when you first listed your item. Choose a second category for your item, then click on the “Save Changes” button at the bottom of the page.
6. You’re taken back to the “Revise Your Item: Review & Submit Listing” page. You should now be able to see that the second category you selected has been added. Scroll to the bottom of the page and click on “Submit Revisions”.

Note that there’s a fee (currently 30 cents on eBay.com) associated with listing your item in two categories. But for items that can be classified in multiple categories, the additional exposure is often more than worth it — the more eyeballs that hit your listing, the more likely people are to bid, and the higher your final selling price can be.
Note that developers who create software applications that integrate eBay can incorporate this functionality into their software as well — use the ReviseItem call to do this.