Hello guys! Im having some trouble removing this edge from the object itself so it can become independent, i can't remember what to do here, this same thing was done on the cartoon building tutorial, i want to take that edge loop out of the edit mode of the building so i can edit it alone, i don't know if i'm being clear, sorry, english is not my main language, i hope the image shows what i'm trying to explain. Thanks in advance!
You can select the edges you want and press "p" and choose "separate by selection. Then it will become its own object. Tab into object mode, select it, then tab into edit mode.