Adding an order level adjustment to a purchase order

Hello,

I'm looking for direction on how to configure the advanced pricing to do the following: I'd like to add a line to an order that is based on a percentage of the total order. I've configured a customer pricing group when I saw in an oracle note that it was necessary for a supplier pricing group. I added the group, and added it to the supplier master, created the adjustment details and added it to the schedule for that supplier. I added a line in the adjustment in two different ways and I couldn't get it