I have looked for the Change Flow Direction but have not found it.
I also looked for the NF structures and I don't find those in the pars list. I have added my own structures but it seems limited as to what parimitors I can edit.
I did recreate my Design surface and that helped the ability to adjust the rims, however I still have a pipe from an inlet and for the MH structure all show as IN so I disconnected the inlet pipe to gat around it.
Tim Grant
Civil 3D 2022.1.3
Windows 10 Professional
Intel Core i7-10700 CPU @ 2.9 GHz
16 GB, 64-bit