No. Each line has an allotted amount and no data sharing.
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If you need more data on one line than the others you might perhaps look into another family plan it might be cheaper or you might find better benefits and features.
No. But your plan should have data stash to carryover whatever data you have not used in this billing cycle to next month. Though you cannot share the data, you may consider using the other lines to be a hotspot device to another one.