about related parameters

a reporting project with 4 parameters,eg.paraA paraB paraC paraD if the
user selects paraA=B then paraB will appears.can this be achieved?Yes, sort of.
You can't have them hidden, but you can have them dependent on one
another so that B can't be selected until after A is, etc.
You would need seperate data sources set up for stored procedures
similar to the following, the paramiters would need to be set up to
query the data source for values:
(optional, you could manually add these values or allow the user to
type a value)
GetParaAList
(required)
GetParaBList @.ParaA
GetParaCList @.ParaB
GetParaDList @.ParaC
You could then have a final stored proceedure:
GetMyReportValues @.ParaA, @.ParaB, @.ParaC, @.ParaD
Note that in this case the report cannot be run unless A,B,C, and D
have values selected.