Excellent guide below on setting up the Citrix Mac VDA.

https://community.citrix.com/tech-zone/build/deployment-guides/citrix-mac-vda/

One little caveat I ran into with this. Once you add additional machines to the Machine Catalog and are ready to add to the Delivery Group, you will see this message when you want to add machines:

I found that it did not automatically add the machines to the Delivery Group. I had to go to the Machine Catalog and select “View Machines.” After doing this, you have to right-click the newly added machine and select “Add to Delivery Group.” Once you complete that step and “Change User,” it will show up in the Delivery Group.

In this example, you see the option to remove. This option is after you have added it to the Delivery Group.