Hi @raymondkingsly, whenever you are working with cross sections you'll need to know there are two main let's say classifications: The "section", and the "section view". The section view is just the grid and offset/elevation labels. However, the cross section or section, is every object that shows up on a section view, say a surface section. From those options you can modify individually the properties/style of surface sections. So, no matter the prompt, the software is asking you to select a surface section. The term section and cross section are used interchangeably

There are also corridor sections which you can only modify their properties using these same commands you are enquiring about.
If you want to learn more about this topic visit the following link: About Sections
I hope this helps. Best regards,
Camilo Fernández
P.Eng | Transportation
