If the invoice has not been created, you will need to create separate invoices for each amount that should be paid.

If the invoice has been created, use the following steps to split the obligation:
  1. In the Invoices stage folder, highlight the invoice that needs partially paid.
  2. Click the Split button at the bottom of the screen.
  3. Select the Invoice stage and click OK.
  4. Click the Distribution tab on the obligation.
  5. Select the distribution line and click Split. (if you do not want the entire amount of the distribution split, click the Partial button and enter the amount to split.)
  6. Click OK.  A new obligation is created for the split amount.