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Solution
Each Team is its own a Zone. Zones/Teams can be easily enabled or disabled for a product/JIRA project in your JIRA Project Administration screen. Your users will have two additional customfields on their screen: One to select the Team of an Issue (Zone Field) and one to select a Team member of the currently selected Team as an assignee (Zone User Picker). The celix Zones Plugin allows to create filters, that show only the issues relevant to your teams. Therefore dashboards can be created once and be reused for all teams.
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