Yes, you can transfer part of another ISA into your Dodl investment ISA, but you must keep current year payments you've made to your other ISA together 🤝 (that’s an ISA rule). Current year payments mean the money you’ve paid in during this tax year (since 6 April). Don't worry, your current ISA provider will work this out for you.

So that means that you’ll need to transfer all current year payments over as part of your transfer or leave them behind. If your ISA only has current year payments, you’ll need to transfer over the whole ISA.