TexDoc, on the assumption that you mean B67 is flagged for holding, this is a Basic Spot/3 and 1 enforcement foul by B that occurs during a legal forward pass play. The Basic Spot for non-personal fouls by Team B that occur during a legal forward pass play is the Previous Spot, and fouls by the opponent of the team in possession are penalized from the Basic Spot. 10 yards, repeat the down. This is not an automatic first down (because the foul was not against an eligible player of Team A), but the yardage would yield a first down. A, 1/10, A-40. However, the penalty will be declined, because the result of the play is more advantageous. A, 1/10, A-45.
This is not a penalty that can be "tacked on" to the end of the play.
Robert