Analytics Software

Hello guys

I have one report that contains a column call type. In the report that I am creating, there are 200 rows in that column, but there are really just 4 types of call type; "A,B,C,D"

So in my report it looks like this

Call type other dim and fact
A
A
A
B
B
C
D
D
D
D

Now I need to add one more column said call counts, which needs to count the occurance of each call types:

Call type count others
A 3
B 2
C 1
D 4

So how would I be able to achieve this on answers? I used "count" function on "count" column, but it is counting all the rows without distinguishing the call type

Please let me know

Thanks