You want to insert the result of the query Top 5 Products as a variable into the query Sales - Calendar Year/Month.
You can now insert the variable into query Sales - Calendar Year/Month. This allows you to determine how the sales for these five top-selling products has developed month for month.
Every time you execute query Sales - Calendar Year/Month, query Top 5 Products is executed beforehand (hence the term "pre-query"). This can lead to longer runtimes. If you do not need to immediately execute the pre-query, we recommend that you use a variable, which represents a precalculated value set. This could be the case for example if you do not need to determine the top 5 products every time, because they only change on a monthly basis.