Top 15 rank v's remaining entities

I need to create a report that shows the top 15 entities with total and share.  This is easy and I can do.  The part I am having trouble with is how to display the remaining entities that are not top 15 and what share they make up.  I don't need to see the detail of the remaining entities, rather just want to see them as a total.  Attached is example of what I am trying to achieve.  Is this possible?

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