Could somebody please help in this?
You can save the new definition of the AW to XML (using AWM's "export to template..." command). This file can be shipped to the customer, who then imports it using the DBMS_CUBE.IMPORT_XML procedure in PL/SQL. This procedure will update the customer's AW to match the new definition. Obviously you should test this yourself before shipping the details to the customer. The only glitch that I am aware of that you cannot redefine an existing "cube script". Thankfully there is a workaround for this if it comes up. (You can edit the new XML to remove the duplicate entry.)