You can import files into NX by using File => import => step, iges, parasolid, part etc…
But sometimes the import function seems empty. This is the result of
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Tag: Iges
You can export part, assembly, bodies or selected objects by using iges export function.
Export to iges options
Command path: File =>
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Exporting iges files in Siemens NX 11
Select which model data will be imported. Unselected data won’t import. (Curves, Surfaces, Solids, Coordinate systems, Product data, PMI)
Read More Importing iges files in Siemens NX 11