Site plan with contours tutorial

Hi there, I’m fairly new to SketchUp and I’m trying to do house design which incorporates the whole building site including contours. Are there any tutorials on how to best achieve this? I guess I would be looking to have this as a separate layer (?) so I can switch this on or off. I need to work with the levels of the site as it has a slope that I need to take into a/c in designing the house and landscape. Any help greatly appreciated. Thank you.

Have a look at the SketchUp Campus and scroll down to SketchUp for Landscape and Site Design.

You may want to use Tags (not called layers anymore) after you create Groups or Components out of your contours (if they are not groups or components already). You can then control visibility by using Tags on your Contours Group or Component. You can also control visibility of Groups and Components in the Outliner.

Have a look at Sandbox Tools: Sandbox tools | SketchUp Help

Should be similar in older versions of SU.