Hide Data Item value in crosstab column

[Web2CRM]

Hello Cognos Gurus,

I need some help/tip on the below concern.

I have one data item with three string values (A,B,C)

I want to display these values of data item in crosstab report in this order:

        DataItem                    DataItem
       A           B                          C

I need some help on how to handle/create an expression that will hide DataItem value 'C' in first column and hide DataItem values 'A' & 'B' in second column.

Thanks!