When delet[ing] FOLIO titles, you first have to use the delete Walter titles function in the dashboard https://walter.drew.edu/cgi-bin/bibServices/dashboard.pl?n=yr&p=BrotherBuzz
Secondly, you find the HRID of the folio title you are deleting. The HRID is under the Administrative data of your search title
After doing so, you click on delete FOLIO titles and add the instance HRIDs of the folio titles you want to delete
Click delete FOLIO titles (and holdings (and items) after you enter the HRIDs
Confirm & verify that you indeed want to delete the titles (and holdings (and items) by clicking def yes
You will then get a confirmation of what was deleted