Sorry to Ask again Defensive switch

I can never remember the answer; this time I will write it down
PLAYER A is in CF I want to move him to LF remove the current LF and replace the CF with Player B. I believe I do it this way:
DEFENSIVE REPLACEMENT
PLayer A (CF) goes to LF (remove for substitution NOT CHECKED)
Player B comes into CF
or should it be
Player B comes into CF
PLayer A (CF) goes to LF (remove for substitution NOT CHECKED
Thanks in advance
PLAYER A is in CF I want to move him to LF remove the current LF and replace the CF with Player B. I believe I do it this way:
DEFENSIVE REPLACEMENT
PLayer A (CF) goes to LF (remove for substitution NOT CHECKED)
Player B comes into CF
or should it be
Player B comes into CF
PLayer A (CF) goes to LF (remove for substitution NOT CHECKED
Thanks in advance