I am not sure I understand your question. Can you post an example of what you're struggling with?

-- Chris. 

Elle est partie,  elle a pris sa voiture. 

Elle est partie en prisant sa voiture.

-- Chris (not a native speaker).

I think you mean - en prenant - n'est-ce pas?

Yes Geree I think you're right. The participe present of "prendre" is prenant

Oh, yes, of course! Silly me!

-- Chris (not a native speaker).