Modify Source and Subsource Code Values
Change source and subsource code values saved in Constituent360 in one of these ways:
Edit the values in the constituent (Contact) Profile page. See Managing Your Constituents.
Overwrite (update) the values on the Profile page with a Custom Constituent Import Operation. See Create Custom Constituent Import.
Apply a client-side method of the Constituent Management API. See Constituent Management API documentation. (This is a highly technical approach.)