Hi light,
Here is your answer. I needed to find a good website to find an answer at: https://exceljet.net/formula/cell-co...of-many-things
Find your file attached where I used a Dynamic Named Range of Problems on Sheet1 and a formula down a column to show your "C" or not. If you add any word to the ProblemList on Sheet1 (look in the Data Tab > Names Manager for the DNR) it should do what you requested.
Search using DNR List IsNumber SumProduct.xlsx
Edit:
You need to put this formula in E1 and pull it all the way down,
Bookmarks