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Actually, you wouldn’t have to change the way data is stored – you could still store height in inches only. But you would need to customize the template markup, so that when the Height field is displayed, the value from the database would have to be transformed into feet/inches with a little bit of math. You’d also have to do some transformations at the time that the items are saved so that the feet/inches is turned into inches before being saved. The hooks are there, you just need to do a bit of work to make it happen.