I also completely agree.  I was able to do this for years with my desktop version of Quickbooks.  Ever since migrating to QBO it has been nothing but frustration.  I can't believe this feature is impossible to offer in QBO.  The ability to hide internal notes in an invoice column when printing seems about as basic as it gets. Or the ability to create a custom column in invoices that can simply be toggled off for printing/PDF.  

PLEASE FIX THIS QUICKBOOKS!!  

I have had to resort to methods that take much, much longer to accomplish the same task. QBO was a dramatic increase in cost for my small business with no new benefits to me.