managing % probability on an opportunity

hello everybody (smile from Paris)

I jusst dowloaded suitecrm and when i create an opportunity it seems there is a relation between Sales Stage and Probability field.

when you create an opportunity you must indicate a sales stage.
when you indicate a sales stage, the system automatically input a value in the field “Probability”.
Egg : Qualification ==> = Probability at 20%

I wanted to reduce the list of possibility in the fiels “sales stage” and also change the number filled automaticaly

can you tell me how to do this ?

Many thanks in advance

finaly I found by myself
in the dropdown editor