The additional bulk Actions tab on the Listing Opportunities page allows you edit your listings in a few different ways from publishing catalog fitment to them.

With the Replace category with recommended category option, you can do just that. For further information, please view our help article outlining our Category Change Tool.

The Republish listing(s) fitment option will allow you to re-send the fitment tied to the selected listings to eBay

The Delete all fitment from listings(s) removes all fitment from the listings you've selected.

Simply select the listings you'd like to edit, then select the bulk action you'd like to apply to them and hit Apply. You can read more about filtering listings here.