You can change an autofill section on a record (i.e., contractor autofill) by clicking on the "Details" tab and then clicking the "Change" button in the autofill section that you would like to change.

You can change an autofill section on a record (i.e., contractor autofill) by clicking on the "Details" tab and then clicking the "Change" button in the autofill section that you would like to change.