check attached link.From BI 4.2 SP03 you can enable the cascading input control.
http://infosolblog.com/web-intelligence-saps-new-golden-child-in-bi-4-2/
Cascading input control is similar to the cascading prompts.for example you have state & City objects. If you will select one state then in the city you will see all city listed in the particular state only.
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