Basket EA buy sell baskets of stocks or indicies

Modyfication of an existing MT5 Expert Advisor which will buy/sell sets of stocks' CFDs in the Long / Short basket.

What I need:

- synthetic chart in MT5 of e.g. combination of 2 long stocks and 5 shorted stocks. I need to be able to easily create new charts of the mixes of stocks / indicies.

- matrix / panel of the chosen stocks' CFDs which tickers one will choose from the Symbol list (at particular broker symbol list)

- adding to the position or closing part of similar set of the stocks that are in the basket

- ATR used as a volatility measure for the basket of stocks (position sizing and for risk management)

Methodology of weighting stocks in the long and short baskets and formulas to generate synthetic index / symbol chart in MT5 to work on the chart:

Also from this symbol I want to trade by sending basket orders that would be 1:1 with the basket created in the long / short panel.

The idea is to open position on One custom symbol (syntthetic index)- then the EA would send a basket order to buy / sell multiple stocks.

As for the Backtesting mode it would be only one chart / symbol created in the Panel

By synthetic chart I mean something similar to this link:

https://www.mql5.com/en/market/product/41173?source=External#description

And by synthetic custom symbol I mean something like this:

https://www.youtube.com/watch?v=HFrpXffd5s8

https://www.youtube.com/watch?v=nBLxrRUm65w