changing material in HFSS

Hi dears
I would like to know if it's possible to change automatically substrate permittivity in HFSS. let's say I want to use diffrents materials for the same HFSS drawing and I want to let HFSS picks one material among a set of materials already selected. I'm a bit confused, can anyone help me out.

You can create new materials which have global variables for permittivity, loss tangent, etc.

Hi, it work with me, many thanks for the help PlanarMetamaterials