[Pic] What are all these datum planes after importing a .IGS file into Creo3?

Disclaimer : In 3DsMAX i had an editable poly car model . Knowing i can only import the model into CREO3 as NURBS a in .IGS format , i converted the editable poly -> editable patch -> NURBS. After I imported the model in .IGS into CREO3, it imported the model correctly, but created like a hundred unnecessary datum planes.
Q : How could I get rid of all these datum planes ? Why were they created?
-Is there a way to simply delete all?
-Could Import Data Doctor help with this? A way to shut off creating these planes?
-Maybe I should try a different import method? like .STL format?
I just need this model as a half-transparent "background sample help" to recreate the car in Creo3.
Thanks for help in advance.
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