How to charge the esim card of Apple Watch? Is it deducted from the original amount?

Independent number 1.eSIM has an independent balance account to provide customers with a separate business number. Customers can pay and recharge through Unicom's official recharge channel.

2.2. The esim secondary card and the 1 dual terminal package are usually paid together with the main card, and the recharge fee can be paid to the main card account.