W. Va. Code § 1-3-9
The courts which, at the time of the passage of the act creating a new county, had jurisdiction over the counties from which it is formed shall retain jurisdiction over all actions, suits and proceedings therein pending at the passage of the act, and shall try and determine the same, and award execution and other process thereon, except in cases in which the plaintiff and one or more of the defendants reside or do business in the new county; which last-mentioned cases, together with the papers and a transcript of the record of the proceedings therein had, shall, after that day, if either party so desires, be transferred to the proper court of the new county, and there tried and determined as other cases brought in the new county.
W. Va. Code § 1-3-9