Two variables (e.g. iHighest & iLowest) should be saved so that the necessary lot size can be calculated.

I would like to use a formula in an EA. Two variables (e.g. iHighest & iLowest) should be saved so that the necessary lot size can be calculated. The value of the original variable should remain saved after opening a position so that this value can be read out further. The value of the variable is pips (Forex) and is therefore saved for a certain time and is not recalculated. Only after closing the position is a new variable calculated and will be used for the next position.