Hi,
check this
Plot( C, "Close", ParamColor("Color", colorDefault ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() );
HLstartTime = TimeNum() >= 143000 AND TimeNum() <= 152900;
HLendTime = TimeNum() >= 153000 ;
HLstartTime = ExRem(HLstartTime,HLendTime);
HLendTime = ExRem(HLendTime,HLstartTime);
High1 = HighestSince(HLstartTime,H);
High1 = IIf(TimeNum() <= 143000, ValueWhen(HLendTime,High1),High1);
Low1 = LowestSince(HLstartTime,L);
Low1 = IIf(TimeNum() <= 143000,ValueWhen(HLendTime,Low1),Low1);
GfxSetTextColor(colorGreen);
GfxTextOut("lH - " + WriteVal(High1) ,200,65);
GfxTextOut("lL - " + WriteVal(Low1) ,200,80);
Plot(High1,"high230",colorGreen,styleNoTitle);
Plot(Low1,"low230",colorRed,styleNoTitle);