Creo Question

Units can be defined for new parts/assemblies by part/assembly templates. So you can have different units default depending on your needs.

For general defaults for such, there are a few parameters that you can set in your config.pro file:

pro_unit_length                 unit_inch
pro_unit_mass                   unit_pound
pro_unit_sys                    ips

These are my settings, you can change them to whatever you wish. If you change them within a part or assembly file you will see what the options are and be able to select what you want. You need to make sure you put the proper value in your config.pro so it will be used by default whenever you start Creo.