Then you create 2 line items in the 'List Properties' module (aligned with S of DISCO) to filter out which member belongs to which subset.
Then you create 2 saved views by using the filter function. The filter refers to the 'List Properties' created in step 2 above. Remember to save the 2 different views.
Then you publish the 2 different saved views to 2 dashboards. You also publish the 2 different subsets as page selectors. This way, a selection made through any of the page selectors will not affect one another.