We have prepared for you the ribbon “Terrain Tools”, which you can download as dgnlib and save in the place specified by the variable “MS_GUIDGNLIBLIST” (File → Settings → Configuration Variables).

In the Modelling Workflow, the tab “Terrain Tools” will turn up after restarting MicroStation; you can use this DGNLIB to customize the Ribbon as per your requirement.

This file is associated with the Terrain Tools (CivTools) in MicroStation 2023 - MicroStation Wiki - MicroStation - Bentley Communities