PATDUT97, we are here to help. We always want to make it easy for you to manage your family's data usage. It sounds like you're referring to making an adjustment to the data limit on FamilyBase. If so, I've provided additional information below. If not, can you please elaborate on your intentions so we can provide the best answer for you.
FamilyBase limits can be changed at anytime. You'll always have the option to allow additional usage or stop the usage at its current amount: http://vz.to/2tJ4YbE
Here are the steps to set the data limits: http://vz.to/2tEbwrc
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