Can I change existing field to a new type and not lose previous data?

[MelB]

I want to pre-populate my Country, State, City fields with specific data so that a user selects a country, then it displays states, then cities in that state. To do this I want to change the field type to select fields and have them set as conditional fields for the parent fields. Would this cause a problem? Would I lose existing data if I did this?

The reason I want to do this is to prevent people adding incorrectly spelled cities etc. and provide consistency with other components across my site.

Mel 

[Alejandro]

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