In SAP ECC you can maintain more than one partner per customer using the Bill-to Party (BP) partner role.
From a customer‘s partner function, select a partner as the designated Bill to Party default address for the SAP Business One business partner.
Procedure
To maintain the default flag and to transfer the preferred partner to SAP Business One, change the customer master as follows:
Choose Sales Area Data and select the Partner Functions tab.
Check whether the partner function for BP Bill-to Party has been defined more than once.
Select the default flag for the business partner number you want to transfer as the Bill-To default address to your SAP Business One subsidiary.
Note
The configuration steps above are for SAP ECC. The steps may vary with different SAP ECC releases. In this case, please check the relevant SAP ECC documentation for the exact steps.
Next Step: Maintaining the Distribution Model for Master Data Distribution in SAP ECC in Integration Hub