Here's what I want to end up with: a part with two configurations where Config A has the cut-out on the left. Config B has the cut-out on the right.
The only way I could figure was to make two separate extrude-cut features, for the two configurations, and alternately suppress them.
But this way means two sketches that must be updated separately.
I'd like to combine the sketch and feature into a single entity.
I tried several things, but came up for air empty handed.