DELETE TRIANGLES

Hello,

We are using Microstation V8i SS3 and Power InRoads V8i SS3.

We have imported a terrain using the Open Roads task by selecting: Create from File->browse to select an xml file, import.  However, we have some stray triangles and would like to delete.  It appears that the Open Roads tasks do not have a "delete triangles" option.  This would suggest that we can only do these type of edits/object development inside Power InRoads.  Is our understanding correct or are we missing something?