I want to create new class of tool for examle ''my company tool library'' Do you have any idea how I can do it?
add a CLASS in :
You need to create a new classs/sub class information on how to do this is in the help files https://docs.plm.automation.siemens.com/tdoc/nx/10.0.3/nx_help#uid:index_mfggeneral:xid384701:xid385...
The above link is where the instructions live but you can search the help Adding New Classes/Subclasses.
Please be aware that anything you add would be overwritten when you upgrade so you would need to be careful also I don't think the automated update of library files works either with custom types.