Hi Carolyn!
You can remove a listing from your linesheet similarly to how you can remove an item from your retail shop. To do so, click into your Listings Manager, filter your sales channel on Wholesale (for unified listings) or Wholesale Only (for only wholesale items), and deactivate or delete your listing. Please note that deleting an item is permanent and we can't bring the information back - I usually suggest deactivating over deleting for that reason. This article explains how to deactivate a listing:
https://www.etsy.com/help/article/184Updating a retail price of your Wholesale listing doesn't edit the Wholesale price at all. However, if you want to bulk edit your Wholesale prices so that they are all 50% off of your retail pricing (or more), you can do so with these instructions:
https://www.etsy.com/help/article/5243#Q8Doing this will not duplicate the listings already on your linesheet. Instead, it will just change your Wholesale pricing in bulk.
Hope this helps!