ohh!! what i mean to say is in other sheets also it will be same like
sheet4 ("M", "Module", "Severity")
sheet5 ("RequestID", "Product", "Severity", "Assignee")
sheet6 ("RequestID", "Username", "Severity", "Assignee")
sheet7 ("RequestID", "Username", "Module", "Assignee")
hope its fine now.. :)