Word or Phrase specifically for a sale or transfer between two divisions or branches of the same company
Are you thinking of a type of transaction that would be described as a Related Party Transaction?
Related Parties: Related parties and business services can take many different forms. Some of the most common types of related parties include business affiliates, shareholder groups, subsidiaries, and minority-owned companies. Related party transactions can include sales, leases, service agreements, and loan agreements.
The quoted Investopedia article expands on some of the points in @Tom22's comment above.