When sketching, on occasion you may want to add an angle dimension and use a horizontal or vertical sketch line to reference from, but what do you do if none are nearby? In SOLIDWORKS 2015 you now have the ability to dimension between a line and an imaginary horizontal or vertical line. Simply Ctrl select a line and one of its endpoints and a reference crosshair appears, giving you the option to select the vertical or horizontal. See images below.
By Jon Weston-Stanley