Add level to custom .dgnlib for Civil Cell

I am trying to make a Civil Cell for Concrete Barrier Wall, Rigid Curb and Gutter in my personal dgnlib. The problem is, I can't get the WallBarrier level to show up because its not in the level library for that file. I can't add or import levels either. I copied one of the FDOT dgnlibs and deleted all the civil cells out so it was basically empty. 

Anyone know how to get new levels in there so I can have my civil cell?

Thanks