Our previous admin incorrectly set up our Accounts and Contacts to use a custom "lead_source" rather than the standard "leadsource" used in Leads. This make it impossible (for me) to map lead source when converting Leads into Accounts and Contacts. At the very least, it requires two duplicate pick fields. How can I prevent losing all of the "lead_source" information, while fixing the error for all new lead conversions? What happens to existing Accounts and Contacts if I just change the Account/Contact Form to use the standard "leadsource?"
Note, I am an end user acting as admin because we don't have one so please make replies as "for dummies" as possible. Thanks!