Question
I do have a question as I have three wonderfully flowering plants and wonder could they be replanted together in one pot or do they need to be on their own?

Answer
Connie, they can be repotted in the same container as long as you are prepared to accept some potential differences and consequences. The flower spikes on some phalaenopsis hybrids die back after flowering while others remain green and may rebloom from the same spike. As with individual plants, repotting following each flowering should be undertaken with fresh orchid potting mix.

If you have purchased these plants in flower there is another consideration.  Some may be more difficult to reflower than others.  By having each in its own container, you may be able to find the best location for growing and flowering it, which may be a bit different than for the others.
Finally, if a plant were to acquire a scale or mealy infestation, by having them together, the infestation could more easily spread to adjacent plants making it more difficult to treat.