Fusion
Actually it is automatic. Once you have selected the "origin - zero" point, selecting geometry , you are wanting to dimension, and moving your cursor in the desired direction before you left click to place the dimension is all there is to it. Take a look at my Screencast (no sournd).
If you cannot figure it out, post your own Screencast to show what you are seeing.
John Hackney, Retired
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Next time this situation pops up, just created a sketch, in the plane of your drawing view, and place a single point where you want to attach an ordinate dimension. Once your view is created, you can make that sketch visible, from the browser in the drawing, and then use it to place your ordinate dimensions. It is a lot cleaner than making a small body.
John Hackney, Retired
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Things have changed in the Fusion 360 drawing environment since the original forum post was made. You now have the Edge Extension command to take care of the "no existent" corner because of your fillet corner instead of the sketch in the model space. Take a look at the Screencast.
John Hackney, Retired
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