Not sure what specific functionality you're referring to but I think @chapter nodes would be a good option.
I have this shortcut defined:
chapter-select ! tree = z
The nice thing about chapters is that they save your view state within the chapter.
So you could have a minimum of two toplevel @chapter nodes maybe:
- @chapter Inbox
- @chapter Work
- My fancy work
- Part 1 of fancy work
- Part 2 of fancy work
And when you flip back and forth between chapters you will be transported back to where you previously left off when you left the chapter. Unfortunately I don't think your position is saved when you close an outline. And actually you don't even need @chapter work if you don't want, since there is an inherent main chapter which is non-chapter view of the tree. In both cases you could use the chapter-next to quickly flip between your chapters.
I'm sure there are 10 other ways to do it, but that is how I would do it.