Incorporating More Fields/more Options In SP

I would like to add a couple more fields that the users can query by, more options how would I add in the same stored proecedure, First Name, Date, and IR#?? so they can have the ability to run it by one field or two fields or all the above?? how would I incorporate those in the stored procedure??






Code Block
ALTER PROCEDURE [dbo].[AdvSearchRevocations]
( @Enter_LastName nvarchar(25) )
AS

IF patindex( '*', @Enter_LastName ) > 0
BEGIN
SET @Enter_LastName = replace( @Enter_Lastname, '*', '%' )

SELECT
LastName,
FirstName,
ReasonOfRevocation,
TM#,
[I/R #],
Date
FROM dbo.Revocations_Tbl
WHERE LastName LIKE @Enter_LastName
END

ELSE
BEGIN
IF patindex( '*', @Enter_LastName ) > 0
SET @Enter_LastName = replace( @Enter_Lastname, '*', '%' )
SELECT LastName,FirstName, ReasonOfRevocation, TM#, [I/R #], Date
FROM dbo.Revocations_Tbl
WHERE LastName LIKE @Enter_LastName

END
GO









is this correct





Code Block
CREATE PROCEDURE [SearchByDateExcls]
(@StartDateServed datetime,
@EndDateServed datetime, @Enter_LastName nvarchar(25), @Enter_Duration nvarchar(10))
AS SELECT IR#, [Date Served], [Reason For Exclusion], Duration, [First Name], [Last Name]
FROM [dbo].[Extended Exclusions]
GROUP BY IR#, [Date Served], [Reason For Exclusion] , Duration, [First Name], [Last Name]
HAVING (Date BETWEEN @StartDateServed AND @EndDateServed, Enter_LastName, @Enter_Duration)