My only concern using the
formulas is that I have another category which has the same projects
name , so I want only the projects  that are between the titles i
mentionned:
A b
1 Opeartion Projects Cost
2 Project1 $40
3 Project2 $50
4 Project3 $30
5 Total operation  Projects $100

6 Capital Projects
2 Project1 $40
3 Project2 $50
4 Project3 $30
5 Total Capital Projects $100


So Like I said i only want to perform  an operation on the projects
that are between the titles Operation Projects and Total Operation
Projects and not the ones that are between Capital
I can not change  the title of thes projects.