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Allow me to assist you, @Frankstop98.
In QuickBooks Online, the checks you have created are automatically set in sequence once entered base on your first set up.
You can select the REF NO. button in your Bank Register to keep your check-in order. Let me show you how:
You can also run a report and customize it to sort by number, please see this article: Print a report in check number order.
In case you need an information to organize your QuickBooks account, feel free to visit this link: Help articles.
You can count on us if you have any other concerns.