You will not save money for the following reasons (personal experience summary)

1. To use a new credit card to repay other credit cards, you need to withdraw cash or cash out, both ways There is a fee. Direct cash withdrawal not only requires a handling fee, but there is also no interest-free period (a daily interest of 5% will be charged at the beginning of accounting). To cash out, you must pay at least 1 handling fee to the merchant.

2. For credit card installments that have been processed, there are two types of handling fees: one is charged all at once (never refunded), and the other is charged monthly. If your credit card is the first method of charging installment fees, then don’t even consider paying it off in one go.

3. "Too many installments" I don't know whether you mean "number of installments" or "multiple installments". Since the installments have been processed, just repay each installment on time and in amount. As long as you don't incur interest and late fees because you forget or only pay the minimum payment.

In summary, using a credit card to repay the installments of other credit cards in one go is not cost-effective, let alone "saving money."

This is a summary of my personal experience in using the card, I hope it will be helpful to you.