Only by drawing the wall on plan, in a position where it can be 'seen' by the elev/section/detail. Make sure it is also on a layer that is turned on in the E/S/D.
It's worth noting that you cannot copy a wall in an elev/section for some reason. Go to the plan and drag a copy there. You can then go back to the section and accurately position it if necessary.
Hope that helps!