The End and Relist function for eBay functions deletes the listings on the marketplace, then immediately recreates it.
Converting a 'simple' listing to a 'variation' listing would be an example of when to use this feature. eBay does not allow the converting of simple listings to variation listings. You will need to delete the 'simple' listing, and recreate it as a 'variation' listing.
1. Go the eBay Edit Listings page.
2. Select End and Relist from the Action drop-down menu.
Something to note. Doing this will cause you to lose any Sales History you have for this listing.