Create One trial file which can be permanent after inserting the Activation Key

I need your clarification for the following:

1- Shall I create 2 copies (One for trial & other for permanent), or Only one can be trial then permanent after inserting the Activation key.

2- In case of Permanent copy; what shall I insert beside “keymaxdays”: ??? in Json…

One copy is enough in this case, and for a permanent copy, do not specify the “keymaxdays" parameter.