Hi @redonion
Rather than attempting to import all your historic data from Wave, I would instead recommend you decide on a logical point to move over to QuickFile and then run a Trial Balance report. This is a balance of all your nominal ledger accounts at a point in time which makes it easier to migrate to a different system.
You can then import the TB file (usually a CSV or spreadsheet file) into QuickFile, I’ve included a link to a guide on how to do that and we can certainly assist you if you want to send a copy to @QFSupport on a private message.