Posted by dellus on Feb 28, 2017; 8:26pm
URL: https://forum.librecad.org/Dimension-annotations-aligned-tp5714692p5714693.html

Indeed a dimension line doesn't provide any snapping. As a workaround you might use 'snap to grid' and place the dimension line on a grid point. With an aligned or linear dimensioning you will have to use always the very same grid point.
Another idea: on a separate layer draw a line where the dimension shall lie. Back on the dimensions layer position them with 'snap on entity'.  
Best of course would be if LC had a "continued dimension" tool. Sigh...