can I send a credit balance on my Apple Card to my apple savings account?

No. Apple Card is a credit card it has no cash balance for you to send anywhere else.

Cash advances from the Apple Card are not supported.

You cannot take cash from the Apple Card in any way shape or form.

If you mean you have "gift card" balance on your Apple Account, (unrelated to the Apple [credit] Card), then also no. Gift card balance on your Apple Account cannot be redeemed for cash or refunded unless the lawn in your country requires it.

click here ➜ Check your Apple Account balance - Apple Support

Is it actually a credit balance? A credit balance is caused by an overpayment or a refund or credit to your account. If it’s truly a balance (overpayment) then yes.

However, if you want to transfer a credit cards available balance to Apple Savings (or any other account), no. Apple Card does not permit Cash Advances.