I don't have ADT so I don't get to play along from home but you might look at something like
dim objRoofSlabs as RoofSlabStyles
dim objRoofSlab as RoofSlabStyle
on error goto ka_blooie
set objroofslabs = thisdrawing.roofslabstyles
For each objroofslab in objroofslabs
objroofslab.delete 'hopefully if the style is used it will toss a binky or whatever Kerry says
next objroofslab
arvyderchy:
Exit Sub
ka_blooie:
err.clear
resume next objroofslab
end sub
This is really rudimentary, really basic, and guaranteed NOT to work as is and is intended merely as a suggestion on one way that it might be possible to go about it.