Offset a curve with constraints

Hi all,

I assume in Vasari, "DIMENSIONS" acts like sketch constraints when you build them linking geometries that are made in Reference Mode.

For the offset function, first I find that the method to pick which side to offset a curve is too tedious. If you hover cursor slightly away from curve wanting to specify which side to offset, it lost connections to the curve.Second, the software does not create dimensions for me automatically, I would assume those should be constraints that pop up such that my model is parametric, or am I doing something wrong.