iCloud payment
My girlfriends iCloud is billed on my bank account. How can I move it over to her bank account?
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Community User
She needs to add her own payment method to her Apple ID.
To add/delete a payment method, go to: Settings → Apple ID → Media & Purchases → View Account → Manage Payment
Select Add Payment Method. Now she has to add her own credit card or other solution. Once she has set up her payment method, she can delete yours. From now on, the payment will be deducted from her card.
You can find more useful information here:
Add a payment method to your Apple ID - Apple Support