When you use the built-in Top List function in the TARGIT client (located in the Calculations tab), you will get e.g. a nice Top 10 list of your products based on sales. However, the built-in Top List function is a bit "harsh" in the sense that it omits all data not in the top list.
Very often people want to present a Top List and, at the same time, present a combined Total of those dimension members not in the top list.
You can do that yourself with a combination of calculations and visibility agents.
Watch this short video guide on how to create a top list, including a "sum of the rest":