What are groups of stops and manuals on organs?

The first thing is do you know what are stops and what they do? There are different kinds of stops. There are the drawknob ones the ones that up pull out or push in other stops look like thin chips. If you ever saw theater organs, that's the best example of those stops. Each stop has a name like bourdon, lieblich getakt etc. At the bottom of the name is a number that number is used to identify the pipe length ex:flute 6 the flute is the instrument and the number is the length so 6 is 6ft. So you play a 6ft. pipe the tallest pipes would be 32ft stops. On a pipe organ for example, you want to play the piccolo, you pull out that stop and when you pull it out it opens the air way to those sets of pipes and when you press a key it makes a sound, but if all the stops are pushed in, the organ makes no sound. Menuals are basically your keyboards on an organ, 2) manuals have a swell and great menuals, and 3) menual organs have a choir menuall added. If you notice the stops are arranged in order, there's the base, swell, great and for three menualls, there's a choir also. The largest organs have 5 menuals, believe it or not, but the worlds largest pipe organ is located in Philadelphia at the Macy's store. This organ has 48 thousand+ pipes. They are all scattered throughout the store, and on Christmas you can actually hear the organ play.