This hole is initially aligned as one of my primary datums (A, B, C), but its unclear to me how I can measure it against UVW to make THAT my C datum and then use it to measure it again against itself?
I understand this is probably 101, but I'm just not processing it.
Not if you only select a single axis for the legacy position or remove the Ø symbol from the FCF (XactMeasure / Geometric Tolerance) and select the planar zone orientation.