Hello AJM0517,
Welcome to the Community page,
So they cant really keep mitigating the data over as it would overwrite all the QBO data.
Exporting out of DT and them importing into QBO would be up to you, it could work but the format of the export would need to be tweaked to import it into QBO. It would also depend on what data it is the QBO import function is split into invoices, bills, sales receipts, etc so they would have to split the export out to specific transactions. Unless they are just imported into the bank feed with date, description, and amount but you may as well just use a spreadsheet to collate that.