Good afternoon, @JamesAWatson. 

Thanks for reaching back out. Allow me to share some insight on this subject. 

There's only one sequence available for auto-population with journal entries. You'd need to choose either JW or EB and then follow with the numbers. 

For future reference, you can check out this guide about how to use journal entries in your QuickBooks Online account. 

Inform the Community if you have any other questions or concerns. I'm always here to lend a helping hand. Have a good one!