Help on Scale in and Scale out in Amibroker

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Hi, Thanks for your Helping us

i need this afl to be Modified with scale in scale out

My condition for Scale out is

When buy or short signals Come Stoploss Remains the Same
On profit side i want to exit 50% of position at Specified Target(like points or in % in intraday)

the afl iam using is




_SECTION_BEGIN("");

Cap=450000;

SetBacktestMode( backtestRegularRaw );

SetOption( "InitialEquity",Cap);

SetOption("AccountMargin",10);

SetOption("CommissionMode",1);

SetOption( "UsePrevBarEquityForPosSizing", 1 );//

SetPositionSize (200, spsPercentOfEquity );



_SECTION_BEGIN("Price");

SetChartOptions(0,chartShowArrows|chartShowDates);

_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));

Plot( C, "Close", ParamColor("Color", colorBlack ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() );

_SECTION_END();





_SECTION_BEGIN("ema_crossover");

x = EMA(Close,3);

y = EMA(Close,8);





Buy=Cross(x,y);

Sell=Cross(y,x);

Short=sell;

cover=buy;

Buy=ExRem(Buy,Sell);

Sell=ExRem(Sell,Buy);

Short=ExRem(Short,Cover);

Cover=ExRem(Cover,Short);





PlotShapes(shapeUpArrow*Buy,colorGreen);

PlotShapes(shapeDownArrow*Sell,colorRed);





_SECTION_END();
Thanks for your Hand on it