Change list values of list menu when value of other list meneu is change

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How to change list values of list menu when value of other list meneu is change? orHow to add or delete items in the list menu?<br />
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for example i have a list menu(num1) contaning (2 & 3 & 4) values selected itam is 2.and i have another list menu(num2)contaning (400.500,600) values when list menue(num1)is selected 2 valeu.<br />
I wish if list menu(num1) values selected change to 3 then in list menu(num2) change list values to (700.800.900.1000).<br />
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very thanks.<br />
sorry for bad english!!<!--content-->
 
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