If you accidentally mark a work as sold or want to undo a sale, donation or gift, you can easily remove that information at any time.
From within a Piece Record:
Navigate to Artwork on the left hand menu of your main dashbaord
Click into the Piece Record for which you'd like to delete the sale
Under Sale Info at the top, click the blue Delete Sale
Confirm this action on the pop-up by clicking Yes, Delete
From the Sales/Donation page:
Click Income > Sales/Donations in the left-hand menu of your main dashboard
Click Actions to the right of the Sale or Donation you want to delete
Select Delete from the drop-down menu.