How can I Import in NX 4.0?

Hallo,
I need to import some cad models in my nx 4.0
I've tried with .stl files and works good but on stl I can't work!!
I can't extract nothing!
can someone indicate the right way?
regards
Maurizio

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please can someone help me!
howcan I manage an stl file in my assembly?
I can't make nothing, as an extract curve, measure ecc....
stl fileis only an image and I can't use it to make related components!

 
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