Within the Invoices section of MYOB Business there is the ability to select invoices, once selected you then only have the ability to either "Email" or "Print PDF." If like me you almost exclusively use re-occurring invoices often I need to spend a fair bit of time going into each and every invoice and deleting it manually.
When you select the invoices there should be an extra button that allows you to do a bulk delete of invoices to cut down on the time it takes to clear redundant invoices.
Cheers,
Darcy