Joining Pillars and Walls Walls and pillars can be joined together. Any number of walls can connect to the pillar as long as space exists on the pillar. To join a pillar to a wall: 1. Click on the pillar. 2. Draw the walls. If the Auto-join feature is enabled, then the walls automatically connect to the pillar. If the Auto-join feature is disabled, then click the Wall Join tool from the Walls tool set and join the walls to the pillar.