Ability to work with multiple vaults as one

[Yurcee]

Plugin – no.
Otherwise, look around here:

Nested vaults - usage and risks

The developers strongly advise against any use of nested vaults, warning that the program is not designed to cope with them and things may break. (Nested vaults are vaults located within another vault. As with any folders, It is possible to have many layers of vaults.) They do however, have some uses: They allow the same vault to be open in more than one window. They allow sub-folders (aka nested vaults) to use a different CSS to other vaults, and to have its own saved workspace etc. They ma…