Multiple groups?

I am new to Zoho - exploring it as an alternative for our small organisation (an NGO on a shoestring budget).

My main question is: in Zoho personal I can create multiple groups. However, in the wiki, I can't seem to "use" these groups, in the sense that:

Group abc can see such and such pages of the wiki
Group xyz can only see other pages

That would be extremely handy for project preparations.

Is there a way to do that, or are the two things separate?