I have the Region dimension, with the values: Sales, Marketing, Human Resources, Maintenance and Purchases.
Sustitution variable
I create this sustitution variable: Region. I add the Sales value .
I add this variable in form number 1.
User variable
I create this user variable: Region. I associate it to "Region" dimension. I add the Sales and Marketing values.
I access to Setup Menu, and I add the Sales value:
I add this variable in form number 2.

Form
If I access at both forms, the data is similar in both cases because I only see the Sales Region.
What is the difference between user variable and sustitution variable?