Good morning Justine
Parameters aren't going to work that way - the are independent from one another - the parameter values are not affected by other parameters
and remember that the Parameter don't do anything in themselves - they need to be backed up by a filter or used in a calculation to affect the analysis - you could use "Relevant Values" in the filters that back up the parameters and get a list of available values for the filter - but then you would be "de-selecting" what is shown in the viz
Dynamic parameters has been a frequently requested idea for development
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