CJCO - Budget Carryforward

Can someone please tell me if a project is set as overall budget, do you have to run CJCO to carryforward the budget, or because it's overall, the budget is year independent and therefore does not need carryforward until completely used?

Also, can you manually carryforward budgets to a new year via CJ30, or does doing that simply create a completely new budget for the new year?