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When can we expect the ability to change field types?Asked by renecerney on June 09, 2015 at 12:36 PM
If I understood you correctly you would like the ability to change the type of a field that was already added to the form.
I am not aware of this feature being implemented somewhere soon.
At the moment what can be done is to add a new field and hide the old one (so you don't loose the data of this old field):
But please provide us more details of your needs so we can find the best solution for you.