Hello,
I am using PTC Creo Parametric 2.0 and I really need to edit an .igs file!
I can import it and open it but i cannot modify the geometry or like modify the original sketch...I am just able to move the parts.
What I need to do is to create another sketch over the geometry and the 3D I import, cause I need to draw and add another "piece" to it.
If anyone knows how to do it please reply! 
Thanks in advance
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Hello and welcome in forum.
One of many possible way that l know is edit iported geometri directly in Creo. See pictures belowe, that represent editing iported feater in assembly and part level.
Assembly options:
Part options:
l hope it can helps you...
