Crystal Reports Filter

Hello,

I have a filter that uses one parameter, and few other criteria.  Here it is:

Local NumberVar Index;
Local BooleanVar Include := False;

For Index := 1 to UBound({?Product Type}) do
    Include := Include OR     {tblRevisions.ProductResultBDHC} LIKE '*' & {?Product Type}[Index] & '*';
Include and

{tblRevisions.Engineer} = {?Engineer} and
{tblRevisions.Engineer} <> "" and
{tblRevisions.CheckerComplete} >= {?Start Date} and
{tblRevisions.CheckerComplete} <= {?End Date} and
{tblRevisions.DrawingStage} = {?Stage}


What I also need to add to the filter is this and I'm not sure how:

if {?RD} = True
include {tblRevisions.JobNumber} > 0
else
include all {tblRevisions.JobNumber} except where {tblRevisions.JobNumber} > 90000 and < 100000

Thanks,
Joel