How to rename a part name in nx which updates in the assembly?
search in command finder for RENAME AND EXPORT COMPONENT,
click the command and select object (which u want to rename the component) u will find a dialogue box Original names and new names.
just the name of component in new names Colum click apply & ok
NOTE: path TOOLS--PROGRASIVE DIE WIZARD__PROGRASIVE DIE TOOLS__RENAME AND EXPORT COMPONENT