Say The Player

Say the player being edited would be desired as a sub (6th or 7th man, for example); this is how: click the "6th" (or desired sub level) checkbox underneath the player's biological name (there are four to choose from optionally); and only one will be "ungrayed" or "degrayed" and enabled, all the others will be gray; whichever sub assignment immediately is next in line to assign will be available for you.

When checking it, this uniquely separate checkbox from the others will set as checked automatically the "6th" checkboxes all throughout his week of games; and by unchecking this inline control, all his games undergo automatic unmarking of his "6th" checkboxes.