Mix the box cake according to directions. I always hand mix my cakes using my Spurtles. Prepare a 7 ' Springform/Bundt pan with a light coating of non-stick butter spray and line the bottom of the pan with a little foil just in case of slight leakage.Pour entire cake mix in the pan. Set pan on a trivet. Add one cup of water to the pot. Set on High Pressure Manual for 35 minutes. Quick release and remove cake carefully.
While cake is still warm poke holes using a straw on the bottom of the cake. Pour pineapple juice on top. Let set for 15 minutes.Flip cake over onto plate. Add remaining crushed pineapple to the center hole if using Bundt portion. If not, feel free to add cool whip on top and remaining crushed pineapple.