merge customer and supplier to single party ID

Summary:

We have an single Organisation Created TWICE as two different Parties (Party ID) as supplier AND customer. Is there a method to merge the supplier party ID and the Customer party ID into a single party with both supplier and customer accounts?

E.g. 

1 Organisation: Org1

Supplier record 

Org1 PartyID = 123

Customer record 

Org1 PartyID=456

We want both to be on the same party ID

Customer record and Supplier record

Org1 PartyID = 789

Content (required):

We have an single Organisation Created TWICE as two different Parties (Party ID) as supplier AND customer. Is there a method to merge the supplier party ID and the Customer party ID into a single party with both supplier and customer accounts?