Subsurface Utilities Box Structure?

Folks:

As I have recently been developing the Subsurface Utilities *.dgnlib for use at our firm, I have noticed that there does not seem to be a command set/ availability to place a Reinforced Concrete Box ("R.C.B". here in Oklahoma)  structure. Am I missing something here, or does the current version of OpenRoads Designer Connect Edition (2019 R1) not have the ability to do such? If it cannot place/ design an R.C.B., are there future plans to implement this often needed structure?

Thanks!

Mark