Needing help creating a formula
 

I am looking for a way to formulate the data in C19-24 as well as D19-24
using the information in A,B,C and D 1-4. Please note it is counting the
data including the months given and the months between. Can someone please
help with a
formula.

Thank you


A B C D
1 JAN JUNE 2 4
2 MAR JUNE 1 16
3 MAR MAR 2 2
4 FEB MAR 3 4

A B C D
19 JAN 2 4
20 FEB 5 8
21 MAR 8 26
22 APRIL 3 20
23 MAY 3 20
24 JUNE 3 20