how to add a script like papyrus script property

[weich]

Hello,

 

I want to add a property to be a script, as in the mission FreeformRiften04, because I want to add a stage that is (0/3),

then guiding me in this mission, I have to create multiple script and in 2 of them I have to set that property .

See if you can tell me how.

 

A greeting.

 

Example image:

 

http://img824.imageshack.us/img824/4302/sinttulogye.png