Can I embed a dynamic private message in WordPress post?

I am aware of this but I would need to create a lot of groups. Imagine 100 different group, managing those would be a nightmare. If Discourse had nested groups, it would have been easy to make this happen like this

  1. Create a group projects category
    2.Create a Project-Work Group and assign it to Group Projects Category
  2. Add subgroups - Group 1, Group 2, Group 3,…
  3. Create a private topic and assign to the right sub group.

This way people on the sub group will be able to discuss a specific project while keeping all discussions related to group project within 1 category. Am I right to assume that Discourse does not have nested groups?

This is a complicated product where group post type has parent/child relationship with other post types in WP. Discussions are part of much bigger feature set, majority of which is already on WordPress. Therefore, the integration is important.