% Trailing Stop Loss Setup TOS Strategy

I am wondering if it is possible to predefine entry price based on signal. That is I want to be able to define what the floating P/L is then be able to have a sell order condition for a % trailing stop based on last highest price. I am using the code below that was posted on here some time ago as a scan for PPS+PMC.

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input xDays = 2;
input price = close;
def ppsBuy = PPS().BuySignal;
def ppsSell = PPS().SellSignal;
def buy = !IsNaN(ppsBuy);
def sell = !IsNaN(ppsSell);
def pmcDiff = PMC().Diff;
def pmcMA = PMC().DiffMA;
def lightBlue = pmcDiff > 0 and pmcDiff > pmcMA;
def darkBlue = pmcDiff > 0 and pmcDiff < pmcMA; def red = pmcDiff < 0 and pmcDiff < pmcMA; def magenta = pmcDiff < 0 and pmcDiff > pmcMA;
def confirmDaysBullish = (Sum(lightBlue, xDays) + Sum(magenta, xDays)) >= xDays;
def confirmDaysBearish = (Sum(red, xDays) + Sum(darkBlue, xDays)) >= xDays;
def confirmedBuy = buy and confirmDaysBullish;
def confirmedSell = sell and confirmDaysBearish;
def buyWithReversal = magenta[1] and lightBlue and Highest(buy, xDays) > 0;
def sellWithReversal = lightBlue[1] and red and Highest(sell, xDays) > 0;
# use this to scan for PPS buy signals that follow bullish PMC
plot BuySignal = confirmedBuy;
# use this to scan for PPS sell signals that follow bearish PMC
plot SellSignal = confirmedSell;
AddOrder(OrderType.Buy_TO_OPEN, BuySignal);
AddOrder(OrderType.Sell_TO_CLOSE, xxx);
AddOrder(OrderType.Sell_TO_OPEN, SellSignal);
AddOrder(OrderType.Buy_TO_CLOSE, xxx);

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