You can choose to pay a carrier the same, static amount (percent) for every load, every time.
1) Go to the Carriers tab at the bottom of the screen.
2) Select which carrier to work with by highlighting the carrier in the upper pane.
3) Go to the Pay Information tab in center of screen.
4) Place CHECK in the 'Pay carrier same every load' box
5) Click the OK button to save your new settings.
From this point on, whenever you add that carrier to a load, Dr Dispatch will automatically calculate and use the percent you specified.