How to load/select object (bar) from Robot file

1

Hi

2 question:

  1. how can i select some object from open Robot file (import ex. Bar ). Then i create ex. curve or line from this object.

  2. It is posible (after select queston 1) make some change in properties ex. change length and save this to source robot file?

I can make this whit Revit with select edge.