There are two ways to change the default levels in Drawings > Dynamic View Settings:

1. Edit the Level Name in the Settings dialog or
2. Change the Level Names in the XML file.

Method 1:

• Navigate to Analysis and Reporting tab and click on Settings to open the Dynamic View Settings dialog:
• Under Auto Dimensions expand Levels
• You can type the new Level Name desired for each object and click on OK

Method 2:

• This action will create "DynamicViewSettings.xml" in "C:\ProgramData\Bentley\OpenBridge Modeler CONNECT Edition\Configuration\WorkSpaces\Imperial(Metric)\Standards\Standards\Data folder.
• Navigate to "C:\ProgramData\Bentley\OpenBridge Modeler CONNECT Edition\Configuration\WorkSpaces\Imperial(Metric)\Standards\Standards\Data folder (depending on Imperial or Metric standard) 
• Edit open the file "DynamicViewSettings.xml" in a text Editor . NOTE - If the file is not found then open OBM, navigate to Dynamic View Settings dialog, open it and then save. This action will create the file in the path above.
• Find and replace the LevelName for all instances of the Object you want to change the Level and save the file