Good to see you here in the Community. Providing you some details about moving from QuickBooks Desktop (QBDT) to QuickBooks Self-Employed (QBSE) is my priority.
Currently, there isn't a way to directly move the file from QBDT to QBSE since both versions are on different platforms. However, you have an option to import your bank transactions from QBDT to QBSE account using .CSV file.
To do this, you can follow the detailed steps on how to import our .CSV file:
Select the Gear icon.
Select Import older transactions on the right for the account you want the transactions to belong to.
Follow the instructions onscreen to finish importing your data.