Hi i added invoices, by sales option import but i need to delete of all again and i want know the correct way to add the sales invoices of Previous year. thank you

If you are using QBO Simple Start or your account > 60 days old, you are unable to purge your account. You should open a new blank QBO account.

https://quickbooks.grsm.io/EU

Visit the following reference to import your invoice data properly

https://quickbooks.intuit.com/learn-support/global/import-or-export-data-files/import-multiple-invoices-at-once/00/632816

As an additional option, utilize the trial version of a backup restore app.

https://rewindio.grsm.io/quickbooks