Dear mladen,

Thank you very much.

I am attaching an MT4 indicator for the logic explanation. I don't have any MT5 indicator.

This Vertical indicator draws past bar from the existing vertical timeline.

The rule for drawing future vertical lines could be bound to the minutes/bars starting from
the existing vertical time line and from the history start date input (lookback period).

The other indicator shows future timelines logic.

However, if you feel it is too complicated and time-consuming, then please modify breakoutbox MT5 by including input for extending horizontal lines as suggested by you
in this post.

Thank you for your help.    

Thank you.