RE: Multiple sites for a Dynamics 365 portal
For each website record, you still need a Portal Subscription. What that means is that there needs to be a "master portal" (which is what costs $500 each) that points to each website record. The documentation is a little deceiving, and doesn't point this out. AdxStudio did have a concept of child sites, but I believe that was deprecated a while ago. Also, creating a new website record from scratch and trying to add all the various web templates, pages, profile pages, site settings, content snippets, etc. is a very tedious and frustrating process. I am going to post a seperate reply with an alternate solution.