If you are using VA7.4 or above you can use parameters.
1. create a new numeric parameter
2. assign the parameter to an input object (like slider, input text)
3. create a filter either directly on the data (data set filter) or on your object. The filter should look something like "x > [parameter name]"
This should work so if you set the parameter to 75 the data shown will be greater than 75.
//Fredrik
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