Hello All,
I found the formula for the main trading day OHLC pricelines (below).
Does anybody have a clue to do H/L pricelines on a base of premarket data only?
Thank you in advance.

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input offset = 1;
input offset2 = 1;
input offset3=0;
input period = {default DAY, "2 DAYS", "3 DAYS", "4 DAYS", WEEK, MONTH, "OPT EXP"};
input period2 = {default DAY, "2 DAYS", "3 DAYS", "4 DAYS", WEEK, MONTH, "OPT EXP"};

plot Data = high(period = period)[offset];
Data.SetPaintingStrategy(PaintingStrategy.DASHES);
Data.SetDefaultColor(GetColor(1));

plot Data2 = low(period = period)[offset2];
Data2.SetPaintingStrategy(PaintingStrategy.DASHES);
Data2.SetDefaultColor(GetColor(5));

plot Data3 = close(period = period)[offset];
Data.SetPaintingStrategy(PaintingStrategy.DASHES);
Data.SetDefaultColor(GetColor(1));

plot Data4 = open(period = period)[offset2];
Data2.SetPaintingStrategy(PaintingStrategy.DASHES) ;
Data2.SetDefaultColor(GetColor(5));

plot Data5 = open(period = period)[offset3];
Data2.SetPaintingStrategy(PaintingStrategy.DASHES) ;
Data2.SetDefaultColor(GetColor(5));

Were you able to find a solution for overnight high low ?