I have to find the count for TOP N. N is any number.

For example, If I have to find the top 10 diagnosis used by doctor, I know how to find the top 10 diag by using the Group sort expert.

But, I want to count the total of top 10 diag used.

GH1: Dr.Smith
GH2. Dx1         count: 80
GH2. Dx2         count: 70
GH2. Dx3         count: 70
GH2. Dx4         count: 60
GH2. Dx5         count: 55
GH2. Dx6         count: 50
GH2. Dx7         count: 45
GH2. Dx8         count: 40
GH2. Dx9         count: 30
GH2. Dx10        count: 20

Now I want the count of (80+70+70+...+20) in GH1. If I use the summary function then that counts all the diags for that DR. that are NOT in top N.

I Just want the count only Top N(10)
Any help???