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Update value of nested variable

I'm using nested variables in Qlikview. The top level variable, vTopLevel, can contain the variables vNested1, vNested2 or vNested3 all of which contain positive integers.

I would like to, as an action, reduce the value of the lower level variable by 1.

i.e., Before the action takes place, vTopLevel = 'vNested1' vNested1 = 3

After the actions, vTopLevel = 'vNested1' vNested1 = 2

I need this to work regardless of which variable vTopLevel contains.