Job Cost and Work Orders

I am looking for a solution in E1 9.1. to report total project costs that may include purchase including rnv, inventory issues, accrual, etc. under one project head. I understand Job Cost can fulfill however I have some questions or concerns:

1. How does Work Order get integrated with Job Cost? we create POs from Parts List, etc. and would like the work orders to be associated to one project.

2. The typical GL account generated by Job cost would be Job.Cost Type.Cost Code which identifies BU.Obj.Sub in GL. We would not like the BU to be job. We have a cost center called