Sure, Dave, it is fine to tie them up. We do so with the cattleyas we grow hanging in the greenhouse for space purposes. It also helps keep them orderly when they bloom. When tying the to the stake, make a loop around the leaves individually or in a group of two and then pull that section to the stake and tie it off. The loop around the p-bulbs should be loose so as to not cut into the plant.
Cheers,
BD