The English expression roll over is often used not only for the everyday action of rolling over or turning over, but also in the sense of “carry over,” “extend,” or “pass on to the next.”
It is especially common in conferences, finance, contracts, and administrative work.
Today, let’s focus only on roll over in the sense of carry over or extend.

3 everyday English examples
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My vacation days were carried over to next year. → My vacation days rolled over to next year.
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My phone minutes were carried over to next month. → My phone minutes were rolled over to the next month.
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Unused points were automatically extended. → The unused points were rolled over automatically.
3 conference and business English examples
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The conference registration fee can be rolled over to next year’s conference. → The registration fee can be rolled over to next year’s conference.
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The deadline for using the research funds has been extended to the next fiscal year. → The research funds have been rolled over to the next fiscal year.
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Unpresented abstracts will be carried over to the next session. → Unpresented abstracts will be rolled over to the next session.