When plot lines and feature lines in the same site cross, they create a split point. This point acquires the level of the line last edited—commonly known as the “last one wins” rule. To prevent this interaction, create separate sites for plots and for the feature lines in a grading plan.
Use the feature line editing commands to edit plot geometry and plot levels. You can access these commands by selecting a plot and then selecting either the Edit Geometry or Edit Levels panels to access the commands.