Datum Graph Feature – Pro/ENGINEER Wildfire
Most commonly used to drive the section of Variable Section Sweeps, the Datum Graph feature can also be employed to provide step functions in regular model development and, can be used to control elaborate transitions in the Curve from Equation function. Take ten minutes to explore what the Datum Graph can do for you.

thanks
@mccormickn – The answer, of course, is yes Relation support not only conditional IF-THEN logic but also simultaneously solved equations involving all manor of params . . . .. Happy Day!
Awesome video. Your tutorials are the best. Also, I was wondering if you can write conditional statements in proE relations or using a combination or relations and params. I figured if someone knew it would be Leo!
very cool