on simple list forms, restrict access to time sheet data based on worker hierarchy

I have a form that shows timesheet info for all entities. (tstimesheettable and tstimesheetline) .

It's a simple list form.

I need to set a restriction where only our finance dept can access every employee data and the other department managers to access only their direct reports. How can I achieve this in the simple form? Can i solve this with executequery () method on the datasource ?

Please help!

Thank you

Ann