Sylvia- L & H is right. A new foot would have to be fitted. I don’t think that the board you are talking about, which I call a cleat, is glued to the actual foot. It usually isn’t. The actual foot is screwed to the pedestal and the cleat is screwed to the underside of the pedestal floor and then held to the foot with one screw. If you remove all of the screws for that foot, the cleat should come off as well as the foot itself.
The best way to repair it is to have a cabinet maker make a new cleat and fit it to the foot, which is easy to do. You don’t need a harp repairman to do this kind of repair. Alternately, the cabinet maker could remove the cracked cleat, glue it back to gather again, and put it back on. That is if it’s not too badly damaged. A repair like that should take no more than 2 or 3 days.