QBO is very limited in what you can do, unlike desktop, why is anyone's guess.

The PO has another problem too, has existed for over a year now, if you use the SKU field on the PO, it shows on screen but does not print.

If you used desktop in the past this is a non partisan comparison of QBO vs QB desktop
http://onsale-apparel.com/Rustler/qbo-or-qbdt
(cost comparisons are at the end of the article)