Welcome to the community forum, @C2.
At the moment, the batch transaction feature for expense or bill in QuickBooks Online (QBO) is not available. You can use the Save and New button when creating purchases.. That way, you can easily move to a new blank form after creating a single expense.
I'll take note of the feedback and submit this along to our Product Development team to help improve your experience.
Please let me know in the comment section if you have any other questions. I'm always here and ready to help. Have a great day!