Would be great if users can select multiple items from drop down. Now you can either select the parent or the child of a list, but not a selection of children. Our users are organized in clusters of items. So when they need to update or export data they need to do child by child.
you may try to create a selection module with a boolean Line Item you call select.
Then the users will click / unclick the select line item for the list element they are willing to update.
Add a filter to your module to display only items that are selected.
That will require your users to refresh their dahsboard after selecting / unselecting. But that will do the job for dashboards.
Your can use this trick for exporting as well . some exprts can be filtered the same way.
Two more ideas :
make sure to manage the "show all if nothing is selected". Add other line items (booleans) and play with the Any / All summary option to to this.
select the parent level with the same logic, and use a lookup to select the children of (/from) the selected parent.