I have a domain as a channel; I also have two subdirectories of that domain as separate channels. I noticed today that the impressions number for one of the subdirectories was much higher than the number for the domain itself. Does that mean that when one separates out a part of a domain--subdirectory, particular page, whatever--its data are subtracted from any being reported for any higher-level channel? (If so, that's awfully confusing.)