(I couldn't think of a better name for this.)

Basically, I want to know if I can add someone else's project to my own as a scene in 7dev.

Well, you can open their project, save it either in your cloud account or on your computer, and then "add scene" in your own project. I don't think you can do it all in one step, though.

I know that's possible, but I don't want to clutter my own projects too much.

Fine, copy it, include it as a scene, then delete it. ;~)

That's $$4+0i$$ steps.

My heart bleeds for you. :~P

???

I just thought I'd make a joke about complex numbers.

Ah, I thought you were complaining about four steps...

I was; I just wanted to joke about complex numbers at the same time.

I ignored the joke and responded to the actual content. :~P

Oh. $$(2+0i)^2$$ steps isn't so bad, though.