Here you can edit general permission type details, such as name, description, etc.
Name - permission type name.
Description - description of the permission type.
Alias - permission type alias. Thus it is used for hard-coding names of permission types within your application code. It shouldn't be changed later. It must be unique within particular application (application part).
Copy to Application Parts - if checked, the permission type will be copied to all underlying application parts, as well as to those that will be created later. If you uncheck it, the permission type will be removed from all underlying application parts it was copied to.