Materials list building area

[pjames]

I want to create a category on my materials list that shows the total square footage of a building - as shown in attached sceenshot. Does anyone know how I can do this? Possible by using polylines? 

 

 

 

[TeaTime]

You can do this with polylines and custom schedules

though I'm sure there's some fancier macro magic that people will offer you, too.

 

*EDIT: goes without saying this isn't a Materials List thing, but in my experience this info is typically presented like schedules are, so might as well use them.

[ChiefArmstrong]

Select and open the exterior room on each floor and add a component like what is shown below.