just one of the possibilities:
1. open a Section/Elevation window
2. draw an ArchiCAD Polyline
3. select it and click on the ArchiForma 3D Polyline tool
4. ArchiForma bring you to the plan waiting for your clicks
5. click to define the insertion point
6. click again to define the direction
That's all
Fabrizio Diodati
Graphisoft Italy Srl | Via Rossignago 2/A Spinea Venezia 30038 Italy