of basically a U-channel, which I drew with version 2.13 on Windoze.
Most of the dimension are integer multiples of 1 mm, except the depth, which should be 17.85 mm. I've dimmensioned all the lines which are multiples of 1 mm, by just picking points near the line, which is easy as the program snaps to the 1 mm grid easily enough.
But the lines which are 17.85 mm don't fall on the grid, so I can't dimension this way.
Is there any way to select a line, then add the dimension to the drawing?