Ok Anita, In that case you can make use of "Exclude Members" in Report Edit options.
Here you can mention all the combinations which you dont want to show in your report...
For your EX:- Dim-1 = 1,2,3,4
Dim-2= ABC
Mention combinations in Exclude Members :- 1C,2C,3B,4A
So atlast you can see your resulted combinations "1A, 1B, 2B, 2A, 3A, 3C, 4B, 4C" can be seen in your report..
Aravind