R12 - What is the purpose of Template Type when Creating Payment Process Request Template

We create PPR Template for various purposes so we do not have to complete the entire PPR for payments. That being said, when you create a template there is a field called Template Type which has LOV.  What is Template Type used for and where do you create these 'Types' so they appear in the LOV?  I figure we can query all of our PPR Templates by Type, like Electronic, Checks, Wire, etc. We are running 12.1.3