In another post, you mentioned not having a depth. You can drape features on a surface, with a vertical offset to assign an assumed elevation.
Bonus Tip: If you add special text to the description or parent fields of the features, you can use them as part of an automatic label. For example - "Depth Assumed - 3' Min. Cover" as the feature Description or Parent and then when annotating features in profile or cross section, enable one of those as part of the annotation.