Optional Parameters in a linked SubReport

Hi All,
I'm trying to get something to work, but can't figure out how to do it ! I think that possibly optional parameters will do the trick.
I have a report that is based on a SQL Server stored procedure takes about 20 parameters and is used as a sub report to display header information on what was selected for the report that it is linked to.
For example, there is a "Supplier Report" that takes SupplierID, CategoryID and Sub CategoryID. These parameters are linked to parameters in the stored procedure in the header sub-report which then goes off to the database to get the descriptions for those IDs and displays them. This is standard across all reports. Now, other reports may not use the Category ID and Sub CategoryID, so in those reports, a value of -1 is passed to the header sub-report and in the logic for the header sub report, those sections are hidden.
At the moment, to set the values as -1, I just have a formula in the main report called DummyXXXID which returns -1. For example if CategoryID and SubCategoryID were not used I would have DummyCategoryID and DummySubCategoryID. This works fine.
However, as more reports are created, the header sub-report gets more parameters to display the descriptions of, which means I have to go back and add 'dummy' formulas to all the other reports that use the header sub-report. e.g. If I have a new report that takes 'WidgetID' as a parameter, the underlying stored procedure for the header report gets @WidgetID as a new parameter and returns a new column of Widget Information to be displayed in the header. I then have to add a DummyWidgetID set to -1 to all reports that don't use the WidgetID parameter so that the header of those reports doesn't try and show Widget information.
What I'd like to do is have the sub report default to -1 (or other values as appropriate to indicate no value) for all parameters in it. In that way, if I add a new parameters to the header sub-report, existing reports will not have to be changed and sub-report links refreshed, since the new parameters in the sub report will have default values.
Is this possible ?? I can't seem to set the parameters in the sub-report to "optional prompt"= true, as they are all fixed at false and there is no drop down to change them.
I hope that makes sense !

Moving to the Design Forum, not an DB question.

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