To create a new library, first create a new project. You can then move a process in that project, or the whole project, to a new library, by going to ‘Edit’ and selecting the ‘Move to library’ option. A window will pop up where you have to specify which process(es) you want to move, select ‘New’ library and give the new library a name.
You can also upgrade an existing project, including all data, to library status. However, as libraries are independent, the data in a library cannot link to data in other libraries. The solution for this problem is to make sure that all data you use in a project link to only one library, and then move the project data to that library instead of a new library.