Install: Put the Onefox_fnc_salvageWheels.sqf in your mission.
Add the following in the config.cpp from your mission: Add it within the CfgInteractionMenus -> Car -> Actions class.
class SalvageWheels: ExileAbstractAction
{
title = "Salvage Wheels";
condition = "call ExileClient_object_vehicle_interaction_show";
action = "_this call Onefox_fnc_salvageWheels";
};
Add this to your initPlayerLocal.sqf.
Onefox_fnc_salvageWheels = compileFinal preprocessFileLineNumbers "Onefox_fnc_salvageWheels.sqf";