Push dynamo geometry from a project to a conceptual mass

Hey all

I have a student who needs to isolate under a complex stair that winds irregularly.
My idea is to export the geometry from the stair to dynamo geometry and to create a conceptual mass from that geometry so I can create mass floor to isolate.

Does anyone know how i can transmit geometry from dynamo to a conceptual mass starting from a project?
It seems impossible that dynamo can work on two projects simultaneously.

Thanks.
Fred

You can transmit geometry to DirectShape or FamilyInstance. There are nodes for that purpose.

Thanks Deniz!