This video will demonstrate a workflow to add a fixed ditch component to a roadway template.
Click the video below to play it. To view in fullscreen mode, first click the YouTube link at the bottom of the video to launch the video on the YouTube site. Then, click the fullscreen button (rightmost button at bottom of video).
Recorded in 1280 X 720 resolution.
the above video shows a drag and drop approach. you get an unchanging ditch, if you already have it as a component drawn as a component/template. there's a full document at http://www.bentley.com/civil/templatedocs/Ditch_Cut_Tight.htm (or https://communities.bentley.com/products/road___site_design/m/road_and_site_design_gallery/271042)