Hello there, Omair.
The option to enter bills in QuickBooks Online (QBO) Mobile is unavailable. I can see how this feature would be beneficial to your business, I encourage you to send feedback directly to our Product Developer Team. They place a lot of value in the ideas provided by users.
To submit your suggestion:
In the meantime, you can create bills using the web browser.
I've also included this article to give you a complete view of available QuickBooks features for each device type and Compare mobile app features.
Reach out to us if you have any concerns about bills. We're always here to help.
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