@cheaponreay01
I would say so , the current partly trade is the newest trade were it acts from , if you open multible trades in the same direction.
Like if you want the ea to open new orders 5 pips in the trend direction you measure that from the newest trade so every time the market is 5 pips over the newest it opens a new one.
But if you only use one trade and want to close it or modify orders when it reaches like 5 pips in the opposite direction you use parrent trade because then you dont need a new point to calculate from .