Filtering specific values in a table

Hello,

I am attempting to create a widget with a table of current values of income for each of our campaigns. 1/6 of those campaigns must use a specific start date for reporting, but the other 5/6 must have an open start date. Is this possible, and where do I begin. 

Background: I have some familiarity with Analytics. I have been able to create the widget with open start dates and also with closed start dates, but I cannot figure out how to make it have mixed start dates. I have some experience using filtered values and formulas, but have not been able to figure this one out. 

Thank you!