It is obviously difficult to define what a creationist means by "new genetic material", but things that seem to fit are new genes produced by duplication followed by mutation, and a gene originating in non-coding DNA becoming a protein coding gene.
So I gave examples of both in the old thread.
The douc langur monkey has a duplicated gene which has mutated to perform part of the function of its "parent" gene more efficiently, leaving the old gene to specialise in another part of its original function. This, I claim, represents an increase in "genetic material", new information, and an increase in complexity.
There's an article on the subject here
An example of a new protein coding gene coming from non-coding DNA has been identified in yeast by the authors of this very interesting paper:
De Novo Origination of a New Protein-Coding Gene in Saccharomyces cerevisiae | Genetics | Oxford Academic
I put both in the old thread because they're interesting stuff, whether creationists want to consider them examples of the evolution of new genetic material or not!
"Hey! I've evolved a clever new gene in my digestive system. That should prove something to those silly elitist humans who insist they're not related to me!"