For example I develop software for trading applications. Let's say I have a trade with its portfolio (an attribute). I want to get the full path of such portfol

For example I develop software for trading applications. Let's say I have a trade with its portfolio (an attribute). I want to get the full path of such portfolio (see it like a floder/filename tree structure). I'm not descending anything, I just need backward propagation... And also I don't want to "remember" the parent path (let's say a long string) by duplicating it in memory for each of its children...