how to code a level based close all?

Hello

How is the best way to code this problem?

I'm trying to make a code that closes all at a certain amount of pips above or below the price of the first trade.

Example: Open a trade at point A. Set a Close price 50 pips on either side of the trade, price B. Now, all the other trades in between point A and B should close at price B.

After all trades have closed, repeat the process.

Ambiguities aside, the plain procedure could go something like this:

If (order) queue is empty, and A and B are empty, return.
Else if queue not empty, and A and B are empty, obtain A and B accordingly. [first trade]
Else if queue not empty, and A and B not empty, close all at B or wait for all to close at B.
Else if queue empty, and A and B not empty, empty A and B.