How to create sites in already existing party

Hi All,

I've a requirement in which i need to create customer sites to already created party and party sites through Customer Interface.

For eg.

There is a party(Supplier) named XYZ and has a site under it. now i need to use the same party and party site and create a customer.

I know I can add the customer by passing ORIG_SYSTEM_PARTY_REF in the RA INTERFACE table with the ORIG_SYSTEM_REFERENCE of that party, but by doing this the customer is getting created under that party but with different party site. I want to have the same party site being shared by the Supplier XYZ and the new customer XYZ.