Add Advance add position like advance take profit

can the develepors please add ,advanced add position like advance take profit, for example ,i bought gbp/jpy on 130 and if it goes against me i want to add a certain number of quantity at 129.50 without being active on the screen like if it hits 129.50 it automatically adds 0.05 lots or more to my position or if it goes to 130.50 add position , sorry for my english