Yes, it is easy. Go to: My Account>Settings>eBay Settings>Update Store Categories from eBay You will need to do this EVERY time you change or add a category in your eBay Store. Good Luck!
Yes, you will need to revise your listings through eBay. If you want to revise the category on one active listing, select the listing, hit revise, go down to edit pictures & details, and then pick the category, and submit. For bulk editing in eBay, go to: My eBay>Selling>click the box next to the items you wish to change>click Edit near the bottom of the page>put a check in the box of the changes you wish to make (like categories)>check Edit Listings in Bulk>click Continue>Drop down the menu for the category and select Edit>a new drop down will appear to the right, select the right category>hit Continue>the next page will show a review page to make sure everything is OK. If everything is OK for all of you listings then hit submit and you're done. Hope that helps.
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