If there is only one subgroup within a parent group, selecting that subgroup will automatically select the entire parent group. When there are multiple subgroups within a parent group, selecting a specific subgroup will only apply the filter to that subgroup.
For example:
In the Level 4 Financial Adviser group, there are two subgroups under the parent group, allowing you to select one subgroup.
In the Level 3 Financial Services Administration group, there is only one subgroup under the parent, so selecting the subgroup will automatically select the parent group as well.