Set the boundaries first
Assign staff to the sites where they can work and give managers the scope they need. Do not use a broad permission simply to make a staff list easier to browse.
Manage Multiple Sites
Share staff without losing sight of local responsibilities.
Coordinate people across locations while keeping each site's rota, eligibility and management permissions clear.
Register interestPlan each location with shared staff in mind
Cross-site workers still have one working life. Check proposed assignments for overlaps rather than assuming another location's rota is unrelated.
Use structure as the organisation grows
Teams, positions and skills help narrow the planning problem. Keep site details and regional settings appropriate for each location.