There is a way to accomplish this using thread prefixes. I’ve experimented with this approach in the past, but at the time the general consensus wasn’t very favorable. In XenForo, prefixes allow you to require users to select a category or label when creating a thread — for example, choosing between NHRA or IHRA when posting. This helps organize content and makes it easier to quickly identify which sanctioning body a discussion relates to.
Prefixes essentially act as structured tags that appear alongside thread titles, allowing filtering, sorting, and visual differentiation without needing separate forums. If we want to clearly distinguish between the two sanctioning bodies while keeping everything in one area, prefixes are likely the most native and efficient solution within XenForo. Definitely a suggestion, just not sure how others feel about this.......