I have a lookup field that displays the standard "name" field (renamed to Service ID) of a lookup object. However, this "Service ID" field stores the autonumberID of the object record and is not intuitive for searching against. Rather, there is also a custom field on the object called "Site Name" which would be far more intuitive to search on.
How would I configure Salesforce so that when I edit the object record and click the search icon on the lookup field I can type in a value and it will search the "site name" field rather than the "Service ID" field.