Multiple Sclerosis 3D Ribbon Display

I have MS and am home all the time I am trying to learn new things (difficult sometimes) I could not figure out in Fusion 360 how to have the base at the bottom of the ribbon so I could cut out the shape of it to fit better, if any one has any good tips on how to do that, that would be appreciated. The #teamGrumpy (my Grandchildren call me that) is for the Walk MS that we do every year that we can