To delete a bill in Alipay, you can follow these steps:

1. Open the Alipay app on your mobile device.
2. Go to the "Bill" section where you can view all your bills.
3. Find the bill that you want to delete.
4. Tap on the bill to open it.
5. Look for an option to delete or remove the bill. This option is usually located at the bottom of the bill details.
6. Confirm the deletion when prompted.

If you are unable to find the option to delete the bill within the app, you y need to contact Alipay customer support for further assistance.