What do you mean? Are you wondering how to do grapple moves only if your grappling? Then use PedIsValid(PedGetGrappleTargetPed(gPlayer))
Heres an example.
elseif IsButtonPressed(1, 0) and PedIsValid(PedGetGrappleTargetPed(gPlayer)) then
ExecuteActionNode(gPlayer, "/Global/Actions/Grapples/Front/Grapples/GrappleMoves/PowerBomb", "Globals/BOSS_Russell.act")
That would do Russells powerbomb only if your grappling.