Are we talking about the issue that you might have multiple solid/sheet bodies in your model and they all being exported when the JT file is created? If that's the case, there's a new function added to NX 9.0 called 'Delete Body', which will remove the selected body(s) from the part model but will NOT remove it from the history tree. It's sort of like it used to exist at some point in time but now it doesn't and therefore will not be included when you export your model. Now the body(s) are not really 'deleted' rather the body(s) were simply removed from the history tree but in a way that does not destroy any parametric relationships. And since this is actually a 'feature', it can be suppressed and unsuppressed like any other feature meaning that when it's unsuppressed it's will be gone, but when it's suppressed the body(s) will return. I know that sounds a bit counter-intuitive but it does work and can be a very handy tool when it's needed.
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Digital Factory
Cypress, CA Siemens PLM: UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.