How wide is the unit, is it 800mm or a 1000mm?
If its the former the post can stay, if it's the latter then....the post has either two screws top and bottom holding it in, drilled through the top and bottom of the carcass or.1 screw and one dowel, if you can get the unit out you can remove it in one piece, if not then you will need a multi tool with a metal cutting blade, and you will scorch the cabinet.