I recently added an additional stall to an existing garage to be used as a workshop. I am installing a subpanel in the new workspace. The outside wall of the original has now become the 4th inside wall. I have mounted the subpanel on that wall which is closed (drywalled). The new walls are open and I have done all the wiring. The question is: how do I get(and meet code) the wiring from the new walls out in to the open so I can connect them to the subpanel?