Well, extension lines for radius dimensions in Creo are supposed follow the dimension automatically. What I mean is, if I create a radius dimension & pull it off the part, the extension line should show just show up & come off the edge. But, it seems if you create the radius dimension from a section entity, it has a problem... it doesn't create that extension line. If I show the view to have hidden lines, then create the radius dimension from a hidden line instead of the cross section edge, it works fine... then I just change the view back to no hidden. Don't know if there's intention in this or what, as long as I know there's a way to do this. Thanks to everyone who responded!
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