We have some fields in SFDC on the Lead that we would now like to have on the Contact as well. They are currently mapped to the Lead object only (as they don't yet exist on the Contact). I seem to recall that we need Marketo to map the Contact field to the same field as the Lead field. Is it correct that this is a destructive process that will wipe the data in the Lead field? Does anyone have experience to add? I'm reluctant to work around this by creating new fields on both because of the issues with all of the references to the fields in SFDC and Marketo, and that you can't delete fields in Marketo, only hide them.