Adding line discount to sales order in Report Designer

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Hi,

Is it possible in Report Designer to add the line discount and percentage so it is visible on a sales order?

I've added the discount by line to the sales order itself so I can add a discount for each line by percentage which is what I want but I can't figure out how to get this to show up on the layout. I'm using the default layout called A4 Sales Order - Plain Paper (Print or Email) and have just added our logo - there is a line for discount but it is the Net value discount and I want to deduct by percentage for each line so am not using that. Appreciate any help!