I am doing a single Air Jordon Shoe, in a size 14.  The max height of one part of the show will be 6 inches.  Do I need to support that part?  I've always supported anything over 4 inches high but it is such a small part (the "high top" part) that I'm not sure if it is necessary.  Any input would be super helpful!  THanks!

The general rule is anything above 4 to 6 inches needs additional support.  I think you will be fine without additional supports.