Heteroscedasticity in categorical fixed factor. Is there a simililar function varIdent of nlem (R) in SAS? -

I would like to know how I can apply different variations of the specific factor in the pro glimm of SAS.

I have done a normalized linear composite model with beta distribution with a fixed fix factor, and there are 3 random factors, and I got a model with its definite fixed factors.

Now I have been recommended in the book "Mixed Impact Model and Extensions in Ecology vs. R.R." Zur et al., 2009, as in RK Package NLM Variance structure like "varIdent".