You can also go to the "Annotate" tab then click on the label icon in the upperleft hand corner which will pop up a dialogue box. Then in the Feature drop down select Profile View. Then in the Label type drop down select Depth. Click on the blue box w/ a pencil, now you have to modify the label style to you company standards, but in order to get the percent grade you go to the "Layout" tab, then in the component name drop down select depth. In the Contents section under Text click in the right column then click the 3 little dots that show up. Another dialogue box pops up and you clear whats in the viewer to the right, now in the properties drop down select "Grade between Point1 and Point2" then press the button w/ an arrow on it, then press okay, press okay again. To add the label press add and it will prompt you to select a prof view so pick the grid in your prof view, then select the 2 points you want to know the grade between. For the grade to be pos/neg the direction you select your 2 points matters, i.e. left to right, or right to left.