I'm having the same issue as everybody else, wishing this was an added feature. QB boasts about making things easier to use, but not seeing it from the slow support from the QB Team. QB member please don't reply with the exact same "solution" that has been posted before. Instead here is a solution suggestion for y'all to take to your software engineers. 

Add a simple check box when creating Products and Services to "Pass on convenience charge to customer." 

If y'all are worried about the legality of it being banned in certain states, just pass on the liability to the QB user in the terms of usage agreement.

            Note: To pass on the liability, go to Terms of Usage and manually add a line in stating user is                                      responsible for the legality of the feature, and repeat this FOR EVERY CUSTOMER YOU HAVE                         INDIVIDUALLY.