How to mass re-distribute unassigned lines from an incorrect capital project to the correct captial

We have a situation where a lot of capital dollars that have been placed in miscellaneous capital projects in Oracle – and left in CIP over months/years. In some cases, after investigating, the business team wishes to redistribute the dollars to proper identified projects. They are currently doing that by going back to the invoices in AP and changing the Project/Tasks.  Unfortunately, sometimes there are many (100’s-1000’s) of invoices and it takes some time to add the project/task and/or change the account on each. What is the best way to re-distribute the unassigned lines sitting on CIP a/c to the