Updating Proposals to Jobs

After working on a budget, and importing that into a proposal, with proper OH and Profit %s added, I come up with a final number.  Does the system update the job so that the contract amount is this total amount?  Does it change when you make it a "contract" or "current" in the job screen?  Maybe you just have to enter in your contract amount or manually pull it from the proposal.  Anybody know?