WordPress multisite question

Hi,

I have WordPress multisite installed.

To explain my situation a figurative example:
– 1 site is mydomain.com and the other mydomain.com/site1.

What I need to do is reverse the 2 sites. So EVERYTHING from site1 gets visible on the main website en everyting from the main website moves to site1.

Now I now that I can find all content of the other site in database like wp_ is main site, wp2_ is second site, etc. But how can I get the mainsite to look into wp2_ tables and get /site1 to look into the main wp tables?

Hopefully someone has any suggestions.