With this tool you can insert an element from your library of files into the scene.
In the dialog box, you can, in the first combo box, select the User Library folder that contains the element you want to insert,
then in the second combo box, select the item you want to insert.
If you want to insert the element as linked, select the option above.
The User Libray folder is normally set in ..\ICMechanical\UserLibrary but you can set it wherever you want, use the IPROSetting tool to do it.