Permissions for one group to assign another group tickets

Permissions for one group to assign another group tickets

Is there a way to adjust persmissions where members of a group can only assign tickets to another group and not to individuals.  We have members of our Help Desk that assign tickets to individuals of a tier 2 group instead of the group itself.  The problem is that the person they assign it to may be on vacation and the ticket won't get looked at until they return.  I would like to prevent that from happening.

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