Colo. Rev. Stat. § 13-1-123.5
In addition to the authority to change venue granted by sections 19-2.5-104 and 19-3-201 for good cause shown, a court, on its own motion, on the motion of another court in this state, or on the motion of a party or guardian ad litem, may order the transfer of a pending action brought pursuant to title 14 or title 19 or rule 365 of the Colorado rules of county court civil procedure to a court in another county when there is an action pending in the other county that names the parent, guardian, or legal custodian of a child who is the subject of the action brought pursuant to title 14 or title 19. The county to which the action is being transferred must be one in which venue is proper. Upon an order for such transfer, the transferring court shall notify all parties of the transfer and transmit all documents to the receiving court. The transferred action continues in the court to which it is transferred with the same force and effect as though originally docketed in the receiving court.
C.R.S. § 13-1-123.5