We have the same requirement. We recently migrated from QB Desktop Enterprise to the QB Online version. We migrated tens of thousands of invoices and were not aware that our custom "COLOR" column field data would not be migrated over. This is an essential part of our invoicing process. We will likely have to revert back to the QB Desktop version if QB Online does not have the functionality of adding a custom column to invoices. It seems like a pretty common sense feature. Surprised and disappointed we found out this late in the process.