Hi Juan,
İt's simple. You must create double variables for buy stop order and sell stop order. Like this:
varbuystopvol=0.10
varSellstopvol=0.10
use this variables into pending order bloks. After then ;
Go to OnTrade Mod. and use Trade Created blok and set to filter "Sell" . and connect to "Modify Variable" blok and modify to varbuystopvol=0.05 (or what are you want?) (Also you can use Adjus parameter into this blok.)
Have a nice day.