How to choose customized groupings for editing
 

In case anyone was looking for this, here is how you apply customized groupings to check edits done for similar positions (e.g., all offensive linemen, all DB's).

*On any given team, choose a given singular position, like QB.
*At the bottom of the editor you will now see that position in the grey band with a check mark and red X in the lower left. To the lower right you see the option for "Customize..."; click that.
*You can now "Open..." and choose one of the groupings I've already made (attached; just house them somewhere on your PC), or you can make new ones.