Is there a way to move commitments from one company to another for a customer. We have 4 companies

We will take a commitment from a customer and apply it to Company 1 AR, Commitment.  Customer purchases from Company 1 and Commitment is reduced according to expectation.  Customer then purchases' from Company 2 and wants to apply commitment from Company 1 to invoices in Company 2.  Right now we are:

- Entering in a Invoice in Company 1 to relieve commitment amount and pay invoice

- Entering in a Credit memo in Company 1 to credit customers account (show monies on their account) offset to suspense

- Invoice out of Company 1 to offset credit memo offset to suspense - manually give copy to AP Company 1

- AP Company 1 enters ap invoice to Company 2 for customer - suspense