exclude parts in the mass compute

[gtsolid]

Good evening to all
I have a table of a set where most of the drawing is drawn, in the sense that they are the parts around what is actually the end of the table (to make the assembly understand).

I see that it puts me the total mass, it's called that not. how can I solve it?

 

[MassiVonWeizen]

in the assembly imposed the parts treated as envelope. in the table do view property and selections show envelope, the parts will be handled automatically according to the model settings