Selecting specific Groups for Spreadsheets/Downloads

I need to be able to group students to gather particular information.  When I go to print out the information, it combines all groups together and there is no way to to tell which group is which.  It puts all of my groups in one spreadsheet.  

This is the total number of students on the spreadsheet

As you can see below there are two separate groups.  In the download section, it would be good to have the option to pick which groups you want to download.