Need help grouping by sales order # and sorting high to low

Hi All,

I am trying to figure out how to Group by sales order number (column F) then sort by high to low dollar amount per sales order(column I). Right now it's sorted by high to low dollar amount by line item.

I have played around with a Pivot Table but the only problem is I need to be able to add comments after sorting /manipulating the data. Pivot tables don't allow editing of any field. I also played around with Data-Subtotal but it didn't want to group like I need it to.

Thank you so much for any help!

See photo below:
2018-01-13 00_05_48-Excel test grouping.xlsx - Excel.jpg