The steps for transferring funds from a supplementary credit card to Alipay are as follows:

1. Open the Alipay APP, click on the "My" page, and select "Bank Card Management" to enter the bank card management page.

2. On the bank card management page, find the bound credit card and click the "Repay" button.

3. On the repayment page, enter the repayment amount and select the "Repay Alipay Balance" option.

4. Click the "Repay Now" button, enter the payment password or fingerprint password, and complete the payment.