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The reveal command I believe is specific for walls.
You can edit the family and put a void in...
I guess what exactly are you looking to do?
LD
I am trying to put a horizontal reveal in a square concrete column. It needs to be 3/4" wide and 1/2" deep and go around all sides.
I am thinking the best way would be to customize a column.
It would not take long at all to do. Even if you have all the columns places - you could select al instances (or just the ones you need) and switch them out in the type selector)
LD