[Vimoutliner] What is "Mark and Gather" as it relates to outlines?

[Samuel Wright]

> Marking allows you to mark arbitrary elements (that is, headings) in the
> outline.  They need not be contiguous, at the same level, etc.
> Gather allows you to gather all these together in one place.  Grandview
> offers various options: move them all below the current headline at the
> same level, move them all as subheads of the current headline, copy
> them, clone them (I think).

Hi Guys,

How is this implemented in vo? I can't see anything related to it in
the vo vim help.

Cheers,
Sam