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MT4 has the possibility to use a trailing stop.
As you can only see the actual trailing stop in the chart,
i'm searching a possibility to show the trailing stop in the chart, since the order is started.

Any ideas how to create something like this?

Alternative:
Connect the highs of a certain period.
With the indicator builder i can connect all highs, e.g.
but how can i manage to select the highs of a certain period only?
for example:
show me the absolut high of the last 10 candles only (result should be one point) and connect it with another high from 10 candles by drawing a line

In the indicator builder you can use the advanced option to create the highest (or lowest) of a formula with a period=n
You can use it to create the highest of the last n bars
That indicator is pretty common so you may find it at mql4.com

Yeah, that's how I do it for horizontal high/low lines. Just set the "Advanced Period" to 10. If you want angled lines, use a Zigzag indi.

Regarding printing your previous trailing stop levels... Rather than trying to call the TS data from your dealer's server (if that's even possible), I would use SB Pro to build an EA to manage TS's, and then harcode ObjectCreate to draw lines on the chart right from the EA.