Change group scope

My understanding was that while you can promote a Global group to Universal, you can't go backwards... Sorry.

For future reference, it's preferable that the only members of Universal groups are Domain Global groups anyhow - this improves replication, especially in large environments with many WAN links and domains.

the implications of changing a groups scope from Universal to Global are commonly related with trust between forests,and the nesting option.
Groups with universal scope can have as their members: accounts, computer accounts, other groups with universal scope, and groups with global scope from any domain. universal group increas the replication because if you made any change all the group must replicate to all d.c
to swich from universal to global group at the properties of tje group change tolglobal