I'm not entirely sure I understand exactly what you are asking, but I'll take a stab at it.
The Gerbing's port is a coax power port that runs straight from your battery. If you have the permanent mounted heat controller the cable runs from your battery to the control dial mounted somewhere on the bike, and then continues on with a female plug you would then plug your heated gear to. If you have multiple heated pieces, you would need the dual heat controller, at which point you would have two plugs to plug the gear into.
If you have the portable controller the cable runs directly from your battery and ends in a female coax plug (with a fuse box in the cable). You would then plug the portable heat controller in to, say, your jacket, and plug the other end into the bike. If you had a jacket and gloves, you would plug the gloves into the jacket, and the two cables from the jacket (jacket plus gloves) into a dual controller, and then from the controller, one cable would lead to the bike.
Whether you should go with permanent or portable is really a matter of preference. If you want to be able to take your heated gear on other bikes, the portable is helpful. If you don't care, then the permanent might be a little easier because you don't have to find a location to stash the portable controller (on your belt, in a pocket, etc).
I personally have the jacket liner and the gloves, along with portable dual controller and love them.