I second this. I know this is from a few months back, but it is still valuable.
I know that is the breakline is created from a feature line, you can go back and manually add PI's at an increment to the feature line but that takes effect for the entire feature line. sometimes you just want to tighten up a curve.
Check the 3D Geometry tab of the Site Properties dialog. I believe that the control you're looking for is there.
Steve
Please use the Accept as Solution or Kudo buttons when appropriate
Mark Green
Working on Civil 3D in Canada
Currently the only way to update the mid-ordinate, weeding and supplementing settings on on featurelines that have already been added to surface is to remove them and re-add them with new settings. Not only is this process cumbersome but adding to the pain is the fact that there is no way to select the featurelines graphically to remove them from the surface definition (unless you erase them and restore with the OOPS command). Without a means to select graphically, the process to determine which breakline groups a number of featurelines belong to is a lesson in tedium.
For now it is up to the user to understand the consequences of adding featurelines with the wrong settings. It's a hard lesson learned. And even if we do understand, we may want to change those settings later. A case in point is when we are roughing out a design we may want to use degraded settings to improve surface processing performance, but as we get closer to final design we need to tighten up the model.
Mark Green
Working on Civil 3D in Canada