Hi Mac -
You can add a column in the schedule worksheet where you would like the window operation to be reported - probably next to the regular column "Sash Operation". Turn on Database Headers under View - in the database header of your new column, add the formula
=IF((Window.SashOperation='Custom'), 'DH', Window.SashOperation)
This will report all custom sash as "DH", so this is only practical if you have only the one Custom sash type. Because Window.SashOperation reports the text string as, for example, "Double Hung", you'll want to add additional logical tests in the string on the pattern of
=IF((Window.SashOperation='Custom'), 'DH', IF((Window.SashOperation='Double Hung'), 'DH', IF((Window.SashOperation='Casement'), 'CMT', Window.SashOperation))) ... etc.
This is also a useful way of converting any of VW's standard text reporting to the office convention.
VW Add Logical Test Column to Window Schedule.vwx