Using Parameters with multiple values in Matrix filter

Hi all

Not sure if this is possible or not, but I can't get it work if it is!

I currently have the following code in as the expression for the filter with Boolean, = and true options selected.

=IIF((Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "2")OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "2A")OR(Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "3")OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "9")
OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "10")OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "11")
OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "13")
OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "14")
OR (Fields!ClientCategory1.Value = "NANTWICH" and Fields!JobType.Value = "13")OR (Fields!JobType.Value = "3NC"), true,false)

I have tried simplifying it to have one expression to cover all the NC and JobType options so instead of having this section

=IIF((Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "2")OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "2A")OR(Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "3")OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "9")
OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "10")OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "11")
OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "13")
OR (Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "14"), true,false)

I would have something like

=IIF((Fields!ClientCategory1.Value = "NC" and Fields!JobType.Value = "Parameter!ShropshireNotJobs.Value")OR (Fields!ClientCategory1.Value = "NANTWICH" and Fields!JobType.Value = "13")OR (Fields!JobType.Value = "3NC"), true,false)

Any help/advice really appreciated, it might not be possible in which case I will just have to use the above throughout the report and change it as and when the criteria needs changing.

Cheers

Cheers Chris