Rhino to Inventor?

I made a series of 2d drawings on Rhino 6 (just lines and all) without the use of surfaces. How would I transfer these drawings into Autocad Professional Inventor 2018 and still maintain the ability to edit it with constraints? Is this possible?

Hi - I take it that you have tried DWG / DXF but that Inventor is not able to add constraints to the curves?
Rhino doesn’t add constraints so perhaps this question is better answered on an Inventor forum?

Rhino will export the same line-work multiple different ways depending on your dwg/dxf export settings.
You might end up with superfine line segments, splines, or arcs - depending on your export.

Good 1st step is to find out Exactly what Inventor needs, and tailor your export filter to give it that.