If I add the Standard field Discount to quote line items than the discount will show up right justified with the percent sign to the right of the value. If I create a Custom field of type Formula(Percent) or just a Percent field I get the value but no percent sign %. Is there a way to format that field so that it shows up with a percent sign?
You could create a custom Text Formula Field and then add in the % symbol. The only drawback (off the top of my head) would be that it won't work as a real percentage in Reports.