Save in a variable the gains or losses that only the last operation takes?

[Juan Manuel Quiñonero]

If I have several open operations, how can I save in a variable the gains or losses that only the last operation takes?

[l'andorrà]

Obviously through a variable catching the last buy/sell trade. But that will depend on your current project buy/sell structure. Ifyou share it I can take a look and suggest how.