I'd even go a step further and suggest different Level masks for basement, first floor, second floor,... sections. One mask for all sections is still quite crude. Just like one mask for all Plan View Levels wouldn't cut it. The DrawingSeeds look like an obvious candidate to store this information and be used for applying it, but if Thomas wants to change an already applied mask, then changing the Seed may be a bit drastic. Turning Levels On/Off and checking for all References manually is not something that's very productive in the scope of a project. AECOsim needs something you can set it up once, and use to apply to DV's (Levels and Reference Levels).
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