Grouping Values from two tables based on a condition

Hello,

I'm trying to make a calculation that somehow group small values together by giving them a different name.

Let's say that the data here is taken from two tables. [User] from 'Users' table and Document Count is basically a distinct count of [DocumentID] from 'Orders' table.

Is it possible to make a calculation that will replace the names of users with a document count < 1 and sum them together? Or maybe DAX isn't the best solution for that? I need that function to be dynamic as I will apply various filters to this page.

Thank you in advance,