Allow User to rank TOP N items plus dynamically create Other group for all the other items.
For example bar chart visual ranks the Top 5 items by category with sum(count or percentage) but also includes a 6th grouping for all the other items which don't fall into the TOP 5. This 'other' category displays the value (count, sum, %, ...) which will give insight into how ALL the 'Other' items compare to the TOP 5.
Luke Walker commented
You should look at using a helper GENERATESERIES() table with an additional column for grouping the "other" category.