Add numbers dynamically down a column

Good day, Gurus.

In the attached sample workbook I am trying to add the vendor number down the column H for each PO. I have copied a few of the numbers into the column, (in red), to show the desired result. Basically, I will have a report daily with a variable number of suppliers, and variable PO's for each supplier. I need to add the vendor # to each row.

Thanks in advance for any help you can offer.