Va. Code Ann. § 16.1-88.02

Subject to the jurisdictional limitations prescribed by law, in any proceeding before a general district court a defendant may, at his option, at any time before trial, plead in writing as a cross-claim any cause of action that he has against one or more defendants growing out of any matter pleaded in the plaintiff's warrant or notice or motion for judgment. The court may order and hold a separate hearing upon any cause of action asserted in a cross-claim.