You could use an expression in column 1 of the tablix to test for Big and another in column 2 to test for Small
This would give you
Big
Big
Big
Small
Small
Big
Small
Small
Big
Big
Small
Big
Small
Or you could put a tablix in column 1 and filter the dataset for Big and repeat for column 2 for Small
Far away is close at hand in the images of elsewhere.
Anon.