When you have selected all 3 fields for an invoice (Supplier, Category & Tax code) in either the inbox list view or in a single invoice, AutoEntry will ask if you want these selections to be remembered:
Clicking yes will save these selections as a default for that supplier. They will then be auto-filled for every invoice already processed and in the future. For invoices where there is a VAT summary on the invoice, AutoEntry will also remember the individual selections PER VAT RATE.
For a one off invoice where a specific category or tax code is required, clicking 'No' will not save the selection and all future invoices will keep using the default selection.
The default selections for any supplier can be viewed/edited under the Supplier Settings page.
The Remember function also works for the Mark as Paid feature where AutoEntry will remember your mark as paid selections for that particular supplier too.