In the previous versions of BP there were several hard-coded options for clearing column contents. However, we would continually get requests to add new/additional variations. And so then beginning with the 2018.3.28 version there are no longer any out-of-the-box options set. Instead you can now create your own selections lists so that you can have quick/easy access to clear the specific columns that you want to clear.
Select ‘Create/modify selections’ and then tick the boxes for the columns that you want to clear. Then set a title such as “Clear all but X, Y, and Z” and use the double-right-arrow button to save that selection list. Then when you select ‘Execute saved selections’ in the future you’ll see “Clear all but X, Y, and Z” available to use. This way you only have to create the list one time, and then you can use it over and over.
-Doug