You see since VA was a state at the time, and hadn't left the Union, it is/was Ok for a state to subdivide. That's normal.
Hi, central_va! Hopefully he'll try better than that, NS is (I hope he's not reading this) one of the "smarter" (it's a relative term when dealing with Clairmont Institue inspired revisionists) pro-Lincoln misinformationsts. I would have to point him to Article IV Section 3 of the Constitution:
New states may be admitted by the Congress into this union; but no new states shall be formed or erected within the jurisdiction of any other state; nor any state be formed by the junction of two or more states, or parts of states, without the consent of the legislatures of the states concerned as well as of the Congress.
If the Legislature of Virginia, a Confederate State and the home of the capitol of the CSA, voted for such a thing, I'm sure I would have read about it.