Merging two Omeka installations

I am trying to see if there is a way to import basically a complete Omeka site into another one already set up. The users would like the second Omeka site to sit as a Collection in the first site. I have dug around a little bit but can't find anything specific. Is there a tool or at least a documented work around for this?

Thanks in advance.

Interesting use case of subsetting an Omeka site! This has been on our minds, too.

There is nothing directly available right now. The best workaround I can immediately think of is to basically clone the site (copy database and files), then strip out what you don't want. Much less than ideal, admittedly.