Batter Count is the number of batter's who've completed their atbat during the current inning.

Pitch Count is the number of pitches thrown to the current batter.

If a defensive or pitching subst is made at the beginning of an inning the Batter Count and Pitch Count should both be zero.

If a defensive or pitching subst is made at the beginning of an atbat, the Pitch Count should be zero.

If you're scoring the game live, and make the pitching subst from the opposing team's scoresheet, these subst details should be filled in for you.

Another thing you need to be aware of - when entering players as defensive only players, they need to be listed after the last batter AND a blank spot. Without the blank batting entry, K-ForCE will assume that the players are batting, and defensive and pitching stats will stop being canculated at that point in the game.