A custom field created in Marketo will not be synced to CRM (unless you ask Support to manually map/sync the field to a field in CRM). That only works when you create the field in CRM - and then select it as a synced field in Marketo. So you're good there. The values for a picklist are done at the form level. You cannot define the values at the database level.
Ok I understand.
Thank you for your reply.