How to View Several Forums Simultaneously

[ShannonA]

Is there any way, either with a variable or a plugin, to read several forums simultaneously, as if they were all part of the same forum?

I'd ideally like to set up the forum categories so that when you click on them, you can read the content of all their subforums.

[Lynne]

There is a modification that will show all the child forum posts in the parent forum. Trying searching for "forum" (or try other terms if that one is too broad) in "all mods" "titles only"