What is VA law surrounding moving a child out of state during a legal seperation and/or prior to the estrablishment of a legal agreement.

Be very careful. Most courts will force the moving party to return the child(ren) to Virginia during the pendency of the suit. It is best to provide the other parent with notice that you are moving. All custody Orders are mandated to carry the provision "in the event that either party changes residences, they shall provide the other with 30 days advance written notice."