How to add global variables inside global variables in Jenkins?

Question

Jenkins

Actually what I have:
There are 3 global variables (Which are set via the Configure system)
For example:

Val1: "A"
Val2: "B"
Val3: "%Val1%%Val2%"

Somewhere I use %Val3% and I see in the console that %Val1%%Val2% is put there.
Actually two questions:
1. Is it a bug or a feature?
2. How can I do what I have planned?

Answer 1

Not 100% sure but try
Val3 = "${Val1}${Val2}"