It would be nice to have a percentage sales verses expense
E.G. Like to see in the report what percentage is advertising compared to sale so I don’t have to transfer info to a spread sheet 
just saying.
Percentage of advertising cost to sales
Manager isn’t a business analysis program. It is an accounting program. So it provides data necessary for you to make your own analyses. That’s why the Export function exists. You have your analysis desires; other users have theirs. It would be impossible to cater to everyone’s thoughts.
While I don’t question that the ratio you describe is useful, even critical, to you, it is not one typically calculated by accountants or business analysts.
True. But in order to do this (business intelligente analisys) it’s necessary to nave custom queries fully implemented…