I would like to be able to have the ability to dynamically add ALL of the feature lines from a specific site to a surface definition as breaklines. If I add a new featureline to the site, it would be a heck of a lot easier if it automatically was added to the "Dynamic Breaklines" rather than me having to add it individually...
or worse, deleting my entire breakline collection and then reselecting them (with my additional breakline) to add them as a group.
You can delete a featureline from the breakline collection in a surface definition, but there does not appear to be any way to add one.