Importing Purchase Invoices into the AP using .csv

We have a very large number of purchase invoices to record by the end of the month.

I would like to import them directly into Sage using a .csv file as I do for journal entries.

I have searched and believe it is possible. There is even an option in the Sage import wizard for importing purchase invoices.  But I cannot find a template nor can I export a purchase invoice method to use as a template.

Can someone direct me as to how to do this? Thank you in advance for any help or guidance on this!