Can anyone explain why on a bill with only expense have an account lets say 6000 on the line item, but the GL impact has account 2000 AP GL and the a 1200 account?

Is there an amortization template selected in the Vendor Bill? That's usually the case because it will post to the prepaid asset/deferred asset which usually starts with 1xxx account number linked to that expense account.

Ah. That explains it.