You can move the folders inside the LrC Library Module and then there is no re-connecting. This is not advised because over the years, people occasionally run into a nasty catastrophic bug where photos disappear, and can't be found in the operating system — photos are gone, disappeared, lost. So I recommend you do the move in your operating system, and then reconnect. If you move some of the folders but not others, then you can't reconnect all folders at once. You may be able to select in LrC just the moved folders and reconnect all of the moved folders at once, I don't know if this works, because I have never done this. A better approach, if possible, is to not put the photos on your internal drive to begin with, put them on the desired external drive at Import, and then the move and the reconnecting is not necessary. If this is a laptop that you take with you without the external drives, then this is not possible.
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