Wage Costs/Budgets/Forecasts Function Viewing

Hi, 

I was wondering if you someone is able to help me. 

In the company i work for we have 3 locations where we have many divisions and each divisions have a head of department in which they are inputting their Rota's each week. 

Within the Rota's there is a budget/Wage Forecast etc but currently they are able to view the whole of the locations budgets and wage costs but how do i restrict their viewing where they can only see their own department costs and budget within this. 

Many thanks, 

Scott Daley