Convert Project costs which were previously capitalized

 Looking for advice on converting project balances into R12 Project Costing, where the project has already been fully or partially capitalized but is still open and expecting more costs.

Are there any flags that can be preset to identify that the cost has already been capitalized so it is not capitalized again after setting up the new project and loading the current values?  Will the Capital projects view display the appropriate mix of CIP vs capitalized costs after conversion?

Or, must we load the expenditures (representing the balance of the costs to date) and run the capitalization to recreate the right balances in Projects?  If so, is there a recommended sequence of events to follow?  What if only a portion of the costs to date are capitalized but they all need to be converted to the new solution?