How to remove a field in a matrix for one specific group?

[tencount]

I have a matrix table above where its grouped by BILLABLE and NON-BILLABLE.  For the NON-BILLABLE group I'd like to hide or remove the Sum of Pmt_Positive field but keep it for the BILLABLE group.  Is this possible?  

Note: I know about hiding the field by dragging the line but was wondering if there was another way through DAX or something similar.

[lbendlin]

You can blank out the value with a measure but you cannot remove the column.

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