UCS Manager
This extension is intended to provide SU users some basic tools to save, restore, delete and list their user coordinates systems (aka UCS) of the model.
UCS Manager

This  script  is  intended  to  provide  SU  users  some basic tools to save, restore, delete and list their user coordinates systems (aka UCS) of the model.

In SketchUp, you cannot save the axis systems you set with the axes tool, and obviously you cannot retrieve an axis system you used earlier or during another session. This extension offers an alternative method to avoid this.

Doc included in the Resources folder of the plugin. See at the end of the PDF how to translate the plugin yo your own language.