Is there supposed to be a "domain mapping" menu item for

Is there supposed to be a “domain mapping” menu item for admins to see on their subsites? if so, what would it fall under, I cannot find it. Not under settings, or anything.

also how does a SSL of a mapped sub-site domain effect the entire network? Does it matter?

Finally, to allow for SSL on sub-site domains, is this where you force the https setting in sub-sites, from domain mapping settings? My question is, if you force the http/https and the mapped domain DOES NOT have an SSL, what will happen? will it error out, or does the domain mapping plugin help recognized whether an SSL is present or not?