Using/modifying imported lines in your model

Hi everyone, my name is Aaron and I'm new to solid modeling as my background is in FEA. 

I have a surface I imported as a parametric file into Evolve and I want to use the lines from the imported geometry to complete the outline for my part. It is a bike rim mold and I want to use the outer surface/line of the mold profile to complete the mold model. Is this possible? 

Thank you, Aaron 

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