You will have 3 part I's--1 for each business arked "on behalf of" and 1 for the transactor marked on behalf of another.
The cash amounts would be broken out as such:
Business 1-list 10,000.00 account number 1
Business 2-list 10,000.00 account number 2
Transactor-list 20,000.00 account number 1 and account number 2, mark multiple
Then on part II you list 20,000.00 on the deposit line.
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.