SSRS Expression IIF Statements

Hi,

I have the below iif statement within my expression. How can I take this further to perform further actions if the result is in fact "B"?

[code][/=IIf(
            (
                  iif
                  (
                        Fields!MandateReference.Value Like "*85397"
                        OR Fields!MandateReference.Value Like "*85398"
                        OR Fields!MandateReference.Value Like "*85399", Fields!Local_Currency.Value," "
                  )
                  /
                  (
                        iif
                        (
                              Lookup(Fields!MandateReportingName.Value, Fields!MandateReportingName.Value, Fields!MandateReference.Value, "d_ExcludedHoldingsGFS") Like "*00001"
                              OR Lookup(Fields!MandateReportingName.Value, Fields!MandateReportingName.Value, Fields!MandateReference.Value, "d_ExcludedHoldingsGFS") Like "*00002"
                              OR Lookup(Fields!MandateReportingName.Value, Fields!MandateReportingName.Value, Fields!MandateReference.Value, "d_ExcludedHoldingsGFS") Like "*00003",
                              Lookup(Fields!MandateReportingName.Value, Fields!MandateReportingName.Value, Fields!Local_Currency.Value, "d_ExcludedHoldingsGFS")," "
                        )
                        +
                        iif
                        (
                              (Fields!MandateReference.Value Like "*85397"
                              OR Fields!MandateReference.Value Like "*85398"
                              OR Fields!MandateReference.Value Like "*85399"), Fields!Local_Currency.Value," "
                        )
                  )
                  >= 0.5
            )
            OR
            (
                  iif
                  (  
                        (Fields!MandateReference.Value Like "*85397"
                      OR Fields!MandateReference.Value Like "*85398"
                      OR Fields!MandateReference.Value Like "*85399"), Fields!Local_Currency.Value," "
                  )
                  /
                  (
                        iif
                        (
                              Lookup(Fields!MandateReportingName.Value, Fields!MandateReportingName.Value, Fields!MandateReference.Value, "d_ExcludedHoldingsGFS") Like "*00001"
                              OR Lookup(Fields!MandateReportingName.Value, Fields!MandateReportingName.Value, Fields!MandateReference.Value, "d_ExcludedHoldingsGFS") Like "*00002"
                              OR Lookup(Fields!MandateReportingName.Value, Fields!MandateReportingName.Value, Fields!MandateReference.Value, "d_ExcludedHoldingsGFS") Like "*00003",
                              Lookup(Fields!MandateReportingName.Value, Fields!MandateReportingName.Value, Fields!Local_Currency.Value, "d_ExcludedHoldingsGFS")," "
                        )
                        +
                        iif
                        (  
                              (Fields!MandateReference.Value Like "*85397"
                              OR Fields!MandateReference.Value Like "*85398"
                              OR Fields!MandateReference.Value Like "*85399"), Fields!Local_Currency.Value," "
                        )
                  )
                  <= 0.3
            ), "A", "B"
     )code]

Thanks.