If on regular QBO not QBSE you can add to the chart of accounts up to the user limits of your subscription. BUT and it is a big BUT - you should avoid if st all possible comingling personal with business expenses in the company file.
INSTEAD take a look at the FREE-FREE-FREE (did I get your attention yet) personal finance program from Intuit - MINT found at mint.com
This is not a paid advertisement - just a suggestion to keep personal separate