This video will demo:

0:10 Setting up accounts in QB
1:50 Setting up productions and services in QB
4:05 Setting up classes in QB
5:57 Connecting QB account to VBO
8:07 Adding default and overriding GL numbers in VBO
11:10 Syncing transactions with QB
13:29 Moving transactions from undeposited funds into bank account in QB
16:36 Quick overview/recap

This help doc goes into more detail about setting up GL Accounts in VBO: How to edit general ledger accounts

NOTE: This integration only works with QuickBooks Online. It does not work with the desktop version.