Intercompany Transaction in R12 with multiple Ledgers without AGIS

We have 5 companies. Each of them is setup in oracle as a LE, each with it's own Ledger and its own OU. 

COmpany A has BSV 100, Company B 200, Company C 300, COmpany D 400 and Company E 500.

We would like to setup Intercompany transactions at GL level and AP level.

I have 3 questions:

Q1. In GL

Can we post a GL Journal Entry in Company A

100.AP Control A/c   Cr 100

200 Telephone Exp  Dr 100

Here, Company A is paying an expense on behalf of Company B.

Is R12 capable of generating offsetting a/c in Ledger 100 and Ledger 200 charging corresponding Intercompany Receivable & Payable Accounts.