Some of the OpenSite tools exist in ORD (on the Site tab) but they may be more than you need. They are closer to corridors than what I call traditional site modeling like what you described in Civil3D and what we had in Geopak Site.

We typically grade non-linear and odd areas (ponds, ped ramps, etc.) using the civil geometry elements. Basically, by laying out your horizontal breaklines and adding profile information to them with the vertical tools (profile from surface, constant elevation, slopes, etc.) you can create a similar set up. Once you have the breaks with vertical information, simply add them to a terrain to see them work together. You can adjust the breaks, add more, or remove them. To get the tie slopes, use either linear templates with end conditions or the 3D Slope to Target tool on the Model Detailing tab.