How to link family-members on SENTRI application

I am in the process of applying for SENTRI passes for my family (myself, wife, 4 children). On this CBP help page it says:

Application Fee: $25.00 per person (or a maximum of $50.00 for husband, wife and minor children)
Fingerprint Fee: $14.50 (applicants 14 years of age and older)
System Cost Fee: $82.75 per person (or a maximum of $165.50 for a husband, wife and minor children)
Total Fee: $122.25 per person

I am aware I need to create an entirely separate login and application for all 6 members of my family, however after completing the first one I don't see where I am presented the option to link family member applications in order to have the application cost limited based on the parts I've bolded above.

How do I ensure I only pay the maximum $50 application and $165.50 system cost for my family SENTRI application?

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Can SENTRI be used as passport?

Yes, you can use your SENTRI card instead of a passport if you want to travel to or return from Mexico by land and sea. I you are travelling by airplane, you need a passport.

How long does it take to get a SENTRI appointment?

The entire process can take between 2-6 months, depending upon the application and interview backlog. Your initial application only requires around 20-30 minutes, but conditional application approval could take up to 6 weeks, and the interview booking time period could be weeks or months.

How do I update my SENTRI card?

How To Renew Your SENTRI Membership

Click on the renewal button.

Update application information, as necessary.

Pay the membership fee.

Satisfy the eligibility criteria.

Be admissible to the United States, and.

What documents are needed for SENTRI interview?

SENTRI Interview Documentation

Your US citizenship or legal immigration status.
A valid driver's license from the US state where you live.
Your vehicle registration and documentation for legal US car insurance.
A notarized letter authorizing your vehicles use if it is not owned by you.

How to link family members on GoMembership

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

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