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You can model springs using the CELAS2 or the CBUSH elements. I suggest the latter since it is simpler to use

In your case, I believe that you should point to the same material for warp and weft, and the material should have the correct, raw fabric density.

I misunderstood your question. Let me try again The warp and weft fiber materials are not necessarily different, but they can be. The warp fiber material is an orthotropic material defining the 0 and 90 degree properties of the warp material. The weft fiber material is an orthotropic material...

You should define the fiber and matrix materials. The software then computes the warp and weft properties of the resulting woven fabric.

The value 100 is the Set Identification number (SID). It is referenced from the NASTRAN Case Control section. So your NASTRAN deck would look something like SOL 103 CEND . . METHOD=100 . . BEGIN BULK EIGRL,100,,,10. . . ENDDATA

This is controlled through the NASTRAN EIGRL card. Looking at your Quick Reference Guide set ND blank, V1 your lower frequency and V2 your upper frequency and you should be set. You can control the content of this card in the NX I/F. It is a solution attribute on the "Case Control" tab.

Since this capability is new in NX752 it will be documented in the "What’s New and Help", which are separate from the 7.5 help.

Do both coupons have different Physical Properties(PID's)?

The GPSORT Case Control command is not yet explicitly supported in the UI. You can add it (or any other CC request) by going to the "Case Control" tab in the solution attributes and add it using the "User Defined Text" Modeling Object. Alternatively you can do a File->Export->Simulation to write...