I'd like to add to this thread.  I am using the Mobile Android version of quickbooks on my Samsung phone.  While i know i can log into Quickbooks Online and add a Default Expense Account for all of my vendors i  wish that information would then be available in the Mobile Version so every single time i create an Expense on my phone i don't have to also add the additional step of choosing what Category/Expense account its part of.  Why this isn't a default option like its been on the iOS version of quickbooks for years completely baffles me.