Billing types - by: keloniton

Hello Dear Mr Babynus;
I know that each billing type is automatically attended based on project type. I appreciate if you help me to understand following matters:
A. Is my understanding of the project types and billing types true?
1. Fixed Price ===> I must define term and billing will be based on define term. No other way to define billing/ Is this true?
2. Time and Material ===> It is based on the real work which is done. I must select the billing lines and the billing will be automatically calculated./ Is this true?
3. Capped Time and Material ===> It is based on the real work which is done. I must select the billing lines and the billing will be automatically calculated./ Is this true?
4. Internal ===> No billing can be defined/ Is this true?
5. Administrative ===> No billing can be defined./Is this true?
6. Template ===> No billing can be defined./ Is this true?
B. How can i define new types of billing in template project type. For example, When i choose a Temple project type, in billing lines of billing menu, i can choose some pieces, days, ... and the the amount and cost, and the billing automatically gets calculated?
Attention: Last night i was testing Projeqtor, I selected Administrative project type, then i went in billing, and in billing line, what i am trying to say in part B happened. I do not know how, But just it happened. But to day, when i choose this project type, this kind of billing line is not shown.
Thank you very much