please , how ican do an offset like revit i have an issue
make closed-loop then make an offset.
how to ?
Not necessary, try SmartOffset from the Wombat package instead.
If you want lines to not crossover each other but being offset like revit does, you can join them as a polycurve and offset after that.
You can use PolyCurve.ByJoinedCurves for that.