Adding a variable to SQL

I'm trying to pass a varchar variable to a MSSQL2K Stored procedure. the varchar (named Filter, varchar(255)) can look like and other WHERE clause you would expect to see. for example: Product_price>20 AND Product_date ## Deliverables Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. Complete copyrights to all work purchased. ## Platform mssql2k