I have asked the same question in another NX Forum. I wanted to know if there is some kind of an "Envelope around Tolerance Stack-up" Feature, much like a clearance analysis. At that time the answer was no.
Happy to know more about the current versions of NX as well
Not in NX that I know of. In the Old I-Deas software we had a 2D tolerance stack analsyis. Siemens does offer the VSA. It is an extra license and cost and works with visview I think. I would like to know more about how this works and how it functions.
VSA is the answer to your question. You can load a NX database with PMI applied into TcVis via VSA/Technomatics and utilitize the PMI. There is a bit of a learning curve like with any software but it will allow you to monte carlo stackups and make easy quick changes with quick results. Hope that helps. Siemens offers training and there are other resellers that offer training as well.
I remember something years ago when we switch to NX from I-Deas there was a tolerance stack function. But when NX went to 64 bit this functionality was not updated to work on a 64 bit system. But My memory about this could be fading also about this. Good topic.
There are two apps for NX that can use PMI and GD&T to do stack ups.
3DCS and VisVSA, as previously mentioned. I know 3DCS is integrated, so it is activated as a workbench right on your model.
Here's a quick link if you want to learn more - http://www.3dcs.com/tolerance-analysis-software-and-spc-systems/3dcs-software
TSV (tolerance stack-up validation) was there in NX (cannot remember till what version it was supported but i guess NX8/8.5 was the last supported version and that too with an env variable).
Now we have VSA or the variational stack-up analysis which can work on the PMI attached to the model.