this is way above my level, but im pretty sure this is possible
what it is is you get this wand or some tool like that and you hit a brick. this then lets you ghost a group of bricks based on what bricks were connected or reliant on the selected brick. now i know this sounds a bit weird but ill try to scenarioize it for ya
you are making a city, and decide to make a water tower. the water tower took a long time to make and you didnt think of macroing it, yet another area would be good if it had a water tower as well. fortunatly you have your duplicator to. you merely go over to the basep[lace the water tower was built on, hit it, and then you can ghost the entire water tower and the baseplate