I would like to be able to set masking layers using the Advanced Drawing Options at a group layer level rather than at the Data Frame (Right click Layers). I have a lot of masking and if I need to copy the layers into another mxd I lose all masking that has been setup. If it was at a group layer level similar to Symbol Levels, the masking would follow the group layer. The ability to set masks in arcpy would also be great. Thanks.