I have various schedules set up to read the Areas of zones, broken up by zone category (eg Buildings and Decks).
I need to see the total area of buildings and also the total areas of Decks.
I don't want to see the total area of buildings and decks combined.
I have tried various combinations withing the schedules but not having any luck.
In the past, I have made the Grand total white, but seems a bit low-tech and has its own issues.
If you are summing and using the flag to group values, I don't think there is any way to have a sub-total without a grand-total.
However in the format settings, try selecting the grand total and making the row height very small, and/or the font small and white pen.
That might hide it.
You could categorize the zones and have 2 seperate schedules, one for building and the other for decking.