SSRS Multi-Value Parameters - Multiple Columns

Hi,

After a break of a couple of weeks, I am just getting back into SSRS reporting. I still need to test out a couple of solutions I got from a previous post, but I'd like to ask another question before doing that.

I have an SSRS Report that needs to be filtered via multi-value parameter selection. I have done this for a single column of values. But I want to be able to allow multi-select based on multiple columns. The column layout is as follows:

AFLAG  BFLAG  CFLAG  DFLAG
X         X          X        X
NULL   X          NULL   NULL
X        NULL     X        NULL
X        X           X        X
X        NULL     X        NULL
NULL   X          X        NULL
X        X          NULL   NULL
X        X          NULL   NULL

In my report parameter, when multiple AFLAG, BFLAG, CFLAG or DFLAG values are selected, I want to be able to display every record that contains an 'X' in each column once in my Report, including where there are multiple values marked with 'X' in a single row.

Does anyone know how I would go about achieving this?

Cheers,

Wayne