Not to take away from Terry's apt & creative tool - love that dude & hope folks support him by trying/buying his apps
For 'sheet flows' in grading scenarios with pads, parking lots, cul-de-sacs, etc, simply create a Surface that has the desired slope(s) & grade breaks then get the 'Elevation From Surface' (dynamic [aka relative] or static, as needed).
If needed for Corridor applications, simply use said 'sheet flows' Surface with Alignment(s) & Profile(s) from said Surface (this is not the same as relative Feature Line PIs).
Cheers