How to make a separate appointment for an American immigrant visa?

The principal applicant must have a face-to-face interview before the deputy applicant, or interview with the deputy applicant at the same time. Deputy applicants are not allowed to interview alone first. The main applicant must make an appointment for an interview with the US immigrant visa before the deputy applicant, or interview the deputy applicant at the same time. Deputy applicants cannot be interviewed separately. Immigration actually changes a person's right to settle permanently in a certain country. May be accompanied by changes in household registration, or may not include changes in household registration; You can immigrate or stay in China.