computation

[Mononoke8]

Hello everyone! I have my problem.
I have to make a computation with revit and I would need to know the surface of the stairs, so the total area of the lifts and pedestrians.
I tried through the abachi but I couldn't get back to the area.
Does anyone know how to do that? ?
Thank you! :

 

[Alfredo Medina]

1. creates a "material 1" for pedestrians, and, it is necessary, another "material 2" for lifts.
2. paint the stairwalks with material 1 or material 2, with the instrument to paint with a material.
3. makes a material abacus. put the parameter "material : name" and "material : area"
4. set the parameter "material : area" to calculate the totals.