Which boots/ shoes, and which figure? One possibility is that you may be trying to use shoes which were made for another figure. In which case, they can be converted to props as kenyarb suggests; they can then be moved and scaled if necessary until they fit, and parented to the figure's feet. Some boots (the P4 women's boots were the first example of this) are modelled already in a high heeled pose, and since the figure's feet are naturally flat, they don't fit. As YngPhoenix says, make the feet and toes invisible; you sometimes have to taper the shins very slightly too (0.1 or so).