How to split a lot

 
For instance, I have a 1 lot of EURUSD, I want to split it into two lot of say 0.5 each.  is it possible?  If yes what is the command?
 
ahseng:
For instance, I have a 1 lot of EURUSD, I want to split it into two lot of say 0.5 each.  is it possible?  If yes what is the command?
If you have a Position of 1 lot it's not possible to "split" it in parts on MQL5.