This is a feature that is a must.  Apparently QB only adds features they can charge more money for.  They are so focused on selling services they are neglecting their core business.  I would consider switching to

QB desktop, but we travel a lot and have remote workers which makes the desktop version not ideal.  Because QBO does not offer this feature, I  QBO mostly  for payables and only use the invoices for small jobs.  Which means I have to create my estimate and billing on a spreadsheet and then enter the income manually to a income category.  I can't predict cashflow, I have to have multiple spreadsheets to do what QBO should be doing for me.  Very complicated and time consuming.  It is very apparent QuickBooks, does not care about the actual functionality and helping users like ourselves.  They are all about the bells, whistles, and the appearance of having a quality product, when in actuality it is only smoke and mirrors.