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To use this functionality go to Budgets → Imports → Imports. To import the NT Submission file note that is should of the xlsx format and that it should have a header row (or the first row will not be imported). Click the button "Upload NT submission" to start the import. This will show a SCOA selection popup. This is the SCOA version that will be used during the import. After selecting the SCOA version it will show an upload modal, here you can select the import file.
If it completes successfully it will show the number of imported lines and asks you to view the batch (these batches can also be found under Budget → Import → Import batches).