Auto Copy PO Line Items into Summary Report

Hi everyone.
I am using an excel PO template to create Purchase Order for supplier.
With this template, I wish to know how I can use macro to auto copy each line items into another summary worksheet that I named it as "Transaction".
Currently, I have to key in all line item manually to create this report, hope someone could help me in this regards.
Attached is the PO template for your reference.

Thanks.
CJ Yap