Can it be said, associate mirror is generating new parts while non associate mirror is not generating new part in assembly ?
How can Move option be used Mirror assembly command?
More deep details for these various options under Mirror Assembly command can be achieved.
Please refere NX help documentation link "Mirror Assemblies Wizard options" for more information.
Regards,Ganesh Kadole#IngenuityIsNX | NX - What's New | Technical Data Package | Assembly Load Performance