Difficult to understand, mainly due to my poor english, I can't guess what means "I ended up" : You have surrender ?

It seems not to be a good idea to call a group "samba", why not "smb_grp" or whatever ?
Then, the option to choose roaming profiles in server-manager is all user wide, it can't be for a group.
May be we can go further but explain s-l-o-w-l-y what you need, and your level (is command-line familiar to you).
A+,
RV