I am not sure what you mean when you say '... and when i click on an item from below one'
It sounds like you want to offer two lists with the same contents as options, so that what the user does not choose in list(A) is offered in list(B).
If the two lists are associated (linked in QlikView) then you probably can't do this. Instead you would have to have them free floating (not linked to the rest of the model).
You could set up two listboes with calculated dimensions. See attached example.
test Two Lists.qvw 147.5 K