Importing items via excel is a fast way to fill in the Invoice and very easy if you have the excel Invoice from the supplier.

Just press the Import Items button and follow the further instructions.*

This feature is unavailable when you have disabled the Empty rows for items in Basic Settings for the PR/PO/Invoice.
To enable this feature, press the tick-box on the appropriate tab 

The template of the file will contain all the necessary fields to create items in the Purchase Order.

If you have some Product Custom Fields in it, it is better to copy and paste the relevant Product Custom Fields values directly from Precoro so that the system can match them.

Please note, this won't be helpful if you are creating an Invoice from a Purchase Order.

In this scenario, matching an Invoice with a Purchase Order will not work correctly. Precoro will recognize all the items as new items.