How do I associate a billing method to a partner organization

Billing Schedules (Billing Methods) can be associated with partner organizations.

To setup the default Billing Schedule/Method for the billable services associated with a program (example: the tabs we see in the Billing Schedule in the Finance Menu for the various kinds of billing schedules used for the billable services (example: Excellus, Medicare, Medicaid, Direct Billing, etc.)), open the Program in Edit Mode. Click on the Partners tab. Either select an existing partner or add a new partner. In the Partner window that opens, choose the Billing Method from the drop-down list that displays in the Billing Information.