Hi guys

I've got a problem with constructing the heel of a girl shoe. As the whole shoe is free form, I've no idea how to build this heel into a solid in the way that it fits to the sole. I have some curves and tried to sweep it but never came to a solid at the end. i see the problem that the sweep ends not planar but because of the freeform sole, I don't know how to be able to sweep it planar and cut it afterwards so that the top shape of the sole is the same as for the heel. Any ideas from the forum?