Delete unused sounds assigned to a Program.

I know you can Delete unused sounds not assigned to a Program. That is already easily done.
Is it possible to mass delete sounds already assigned to a Program that was not used in any Sequences.

Example:
If I load a purchased Program from a kit, say Masada's Cycle Kit.
It Auto populates a Program for you.
I use a few of those sounds in a Sequence.
How do I mass delete all the other unused sounds in the Program.

My intention:
Not to save a huge filesize each time I use a Program kit.