Hi, @zhengyun-lmexpre. Thank you for reaching out to the Community.
We understand the urgency of deleting bills in bulk. However, this feature isn't available in QuickBooks Online (QBO).
To help improve your experience with QBO, your valuable feedback will be shared with our Product Development Team.
Here's how to send feedback:
1. Go to the Gear icon, then select Feedback.
2. Enter your comments or product suggestions.
3. Click Next to submit.
Also, I recommend these articles related to bills that you can use in the future:
Please don't hesitate to reach out if you have any follow-up concerns regarding bills. I'm here to assist. Have a good one!