horizontal line showing only to right of price bar, how do you draw?

[david]

I am hoping that someone might tell me how to reference or set up a horizontal line, that when added to the chart will only appear in the area to the right of last price bar or candle and adjacent the price axis.

I am happy to add the lines manually. Seems this would be a good way of removing clutter from the screen.

I searched various posts and articles but remain confused particularly in how reference the position to the right of the final price bar (varying time?) or do you reference back from the price axis?

thanks form this Newbie in advance

Dave