Use the step:
( listed under the Found Sets group )
From Help On Line:
Omit Record only operates in Browse mode and Find mode. When this script step is performed in Find mode, it causes the find request to become an Omit request, as if the Omit checkbox had been selected.
That doesn't do what I want, since if first I find the record, and then omit it, there is nothing left in my found set. I need to find and omit at the same time, not in two steps.
I have added something to my previous answer...
Thanks! That should be documented somewhere. It's a perfect example of why you should never use the same function for two things...