For the example you gave, you could simply use the Quick Table Calculation for "Percent of Total" (which is calculated in Tableau as SUM([Sales]) / TOTAL(SUM([Sales]))) to show each team's % of the league's total. I'm not sure if this will apply to your situation. If you can post an example workbook, someone can help you visualize a solution.
I've attached a very simple example using the sample data provided with Tableau. It shows Customer Segments and their % of total sales.