Taking Profits while still available

I would like anyone to educate me on how to take a portion of my profit for a trade that is in profit. what I mean is if I have a trade with 2 lots in profit and want to liquidate 1 lot and allow the remaining 1 lot freedom as the market moves. This is different from trailling with a certain number of pips. Just to take a part of profit and allow the market to develop.This is possible on a platform I have used before.

I wish someone can assist in this regard on meta trader.

Thank you.

EADeveloper:

OrderClose(OrderTicket(),1,OrderClosePrice(),Slippage,Orange);

open 2 lots:

OrderSend(Symbol(),OP_BUY,2,NormalizeDouble(Ask,Digits),SLIPPAGE,NormalizeDouble(sl,Digits),NormalizeDouble(tp,Digits),Hint,Magic,0,Blue);

after close 1 Lot:

OrderClose(OrderTicket(),1,OrderClosePrice(),Slippage,Orange);

open 2 lots:

OrderSend(Symbol(),OP_BUY,2,NormalizeDouble(Ask,Digits),SLIPPAGE,NormalizeDouble(sl,Digits),NormalizeDouble(tp,Digits),Hint,Magic,0,Blue);

after close 1 Lot:

OrderClose(OrderTicket(),1,OrderClosePrice(),Slippage,Orange);