Long Term savings buckets

Just had a thought, but could it be worthwhile setting up say multiple pies to segregate the same holding?

What I’m thinking, is say stick £10 a month into an Sep 2030 pie, then next year start a Sep 2031 pie and so on.

That or, every year if/when I get a bonus, stick a 10% slice away for say 10 years.

Almost a bit like a fixed term S&S account, that you have full control over the maturity, e.g. you could allow it to roll forward a few months if markets were a bit like March this year.