I need to change the picklist field type to multi-select. Will there be any risk to make this change or can I lose information?
2 answers
Currently defined picklist values are retained when you change a picklist to a multi-select picklist. If records contain values that aren’t in the picklist definition, those values are deleted from those records when the data type changes.
https://help.salesforce.com/s/articleView?id=sf.notes_on_changing_custom_field_types.htm&type=5
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