Hello, I am wondering if there is a command that allows you to select an existing polyline. I have imported my plan from AutoCAD and looking to extract some shapes based on existing lines I have drawn. In Revit I know there is a command called PickLine. Is there something similar in Rhino 7?
Usually, you can use the left mouse button to select any unlocked objects in the scene, inchluding lines. You can try using the left mouse button to directly pick the lines you need in the scene.
For the basic selection method, please refer the detailed instructions in the help section
Hi @Shawn7
ExtractSubCrv might be worth a look also 
HTH, Jakob
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oh my gosh that was so obvious haha. Thank you!
Would that work if you have an extrusion but no longer have the initial polyline?
Hi @Shawn7
Use DupEdge to “convert” the edges of existing 3D geometry to curves.
-Jakob