OIC.
As much as I would love for Carbide Create to have a full constraints sketcher, and as much as I wish I were successful at using the various opensource and other tools which have such features, the best I’ve managed at what I believe you are asking after was with Alibre Atom3D:
that said, I kind of crashed and burned in it when I wasn’t able to use the sketching tool in it for the better part of a year, apparently because I needed to delete the preferences file for the program (see the Alibre Forum for the details).
that said, other folks who are more patient and better at 3D user interfaces than I am do quite well in Alibre, so I feel quite comfortable recommending you at least give it a try if it suits your budget.
If you want a persistent thing for measuring in Carbide Create, ctrl-clicking w/ the rectangle tool will allow drawing from corner-to-corner — for complex projects I’ll often create a layer for such dimension measuring objects, hiding and showing it at need.