Hello @paul j12 👋, Welcome to Interconnect 
Intercom using Salesforce solution for Interconnect, I don't think that building community product in the nearest plans of Intercom.
You can for sure request this feature in @Product Wishlist group.
Meantime, I'm suggesting taking a look at some most popular community portal solutions:
- Discourse - It's free and used by Cloudflare, Amazon and etc...
- Circle - New start-up product with quite good design
The same question asked by Josh 2 months ago, I will also include the link to the following post:
Forum Like Capabilities
I hope this will be helpful 🙌