Phone numbers and email addresses from lead to company

By default the business number and email address will copy to the business phone number and person business email field when a lead converts. I am sure this is handled with translations, but I cannot find annything about it. If I had mobile on the lead, how would I ensure that linked to the mobile number on the person? Similarly with email address types. I could do it with a tablescript but I am convinced there is (or was) a way of doing this with translations.


Thanks.