How to average TP from multiple trades ?

[aggarin]

Hi,
can someone advice how I can average TP from multiple trades (either from buy, sell or add to volume blocks) ?

I'd like to create martingale EA, which add more volume when the price go opposite from previous trades and every time new volume was added, the TP will be modified by weighted with the new volume.

Note: I've used "add to volume" but the TP will be the same as 1st trade, and when using buy or sell the TP will be separate by each trade.

Thanks in advance.