You might also want to look into using the Product Interface functionality:
Useful product interfaces include the following:
Faces that should be used for mating when you add your part as a component to an assembly.
Another reason it may not show up is if you don't have the "Assemblies" application chosen (in the "Applications" ribbon tab - it should have a different color background than the rest of the ribbon bar background)
Production: NX10.0.3.5 MP16/TC11.2
I'd rather be e-steamed than e-diseaseled
Thanks, everyone, for the info. After knowing where to look, I was able to find the override position option. I'll have to look a the instructions for that and try working with it. I'll also need to review the product interface info. Thanks, again. I do appreciate the help.