Ok, I tried it with a solid and it doesnt work, but with a surface it will.

Try this with your solid model first though...

Create a plane above your geometry, make sure the plane doesnt intersect the geometry. Draw on this plane straight lines, one at each interval you are trying to measure. I think each of these lines will have to be a separate sketch though. Make sure the lines you draw extend beyond the edges of the geometry.

Once you have that, go to Insert_Curve_Split Line. Select projection. Select your line. Select your geometry. Hit ok. Now you have a line the wraps around your geometry in the places you want. Repeat for each section.

Even better yet!!!

It is also possible you can simply create a drawing of your model, and pull your model into that drawing. Within the drawing just specify a series of cross section lines and it will automatically create the cross section for that area. Place that wherever you want and dimension it or simply set it to full size and print.

HOpe all this helps.