When running the security assist wizard to create the pages, on the manage pages tab, you can set the field types to use for different columns in the database.
click the edit icon in the configure find settings to set the field types.
you can then edit each of the pages to set which fields should show on those page.
If you are trying to do this after the pages have been created:
If you are replacing an existing field with a new one, make note of the existing fields name, and when you convert it to a select list, make sure to use the same name.
if you are adding new fields, you will need to edit the Insert Record server behavior to bind the corresponding columns to the new form elements.