I have read the whole help section, and searched here, so sorry in advanced if this has been covered.
When doing reports (Page Builder) how do you get it to not pull previously used calculation areas that are still in the statistics window on the model but zero'd out?
I don't 100% follow the question, but if you're saying that you've got items that technically should be displayed in a Schedule, and you don't want to see them when you display others, you'll find that there's the ability in a Schedule to only display a certain range of data.
In practise that might only work for certain cases.
Alternatively, if you've got stuff in the model that you're not using at the moment you can disable them instead in the Project Manager.