OCA orders via API

In the API documentation it says I can BTO in the normal way and add ‘&profittarget=’+pt+’&stoploss=’+sl to get a trio of orders, the parent BTO and profittarget and stoploss children in an OCA group. Is there an easy way to enter the profittarget and stoploss if the BTO order has already been filled? For example, what if the BTO occured yesterday and I wanted to enter bracket exit orders for today?