Billing Schedule

I'm trying to create a billing schedule that I thought was easy, but has now become more difficult. We want a schedule that is $120 up front, 30% (less $120) in 30 days and the balance 30 days prior to the show.

The issue I have is with the 30% (less $120). I can't figure out how to write that in the bill amount. Any suggestions?

Michele
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