Modification to an existing EA with mq4 file

I like the ea entry method. I like the ea exit method sometimes.  I need an optional exit method.  If I do not select the optional exit method, the ea should run as is.  If I select the optional exit method, the ea should make entry as is, but the exit method should change to: exit at predefined profit target or exit with the average down method as following when drawdown happens:

1.  At predefined A pips drawdown from initial entry, add a position with same lot size as initial entry, exit all positions at initial entry plus B pips.

2. At 2A pips drawdown from initial entry, add another position with twice the lot size as initial entry,exit all positions at A pips drawdown from initial entry or exit all positions at (2A+predefined B) drawdown from initial entry.

I will provide the ea file once I select a candidate.