Any teacher or user can be given access to as many Rosters as needed, as long as that Roster exists for a school.
If a Roster hasn't been created yet, check out our article, Creating a New Roster!
To share a Roster with a teacher, go to Setup > Users > open the User Details page > click on "Add to Roster".
Teachers can only add other Teachers to Rosters they already have access to, but those with Site Leader or Admin access can share all Rosters.
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