I presume you don’t want to allow users to Edit the columns only clear them?
You could create a specialized Detail view that has 4 buttons for your use cases and shows the 3 columns.
Personally, I would create Inline buttons and place right in the table view row next to the column. When a user wished to delete/clear the column, they can do so right form the table view with no need to navigate elsewhere.
But I wonder…what happens after they clear the values? Do they update with new values?
If they are simply going to re-populate with values again, then why not just allow them to edit the columns directly in a Form View? If there are concerns about data mis-match, you can use validations to control that…but of course I don’t know your exact use cases.
I cannot create the inline (solution that i prefer) cause the columns are hidden if notblank.
I hope i could create one only action button in Primary position leaving the user to select clicking on it on a pop-up the 4 items (one or multiple or all) to “clear”. Any hints ?