Hi, sorry, didn't see this was updated again until just now!
By "group", do you mean something like "I have many channels from the same XY coordinates"? If so, yes, this is precisely what NamesAndTypes was meant to do, I recommend reading the part of the manual I linked to in a previous post to learn more about how to do this. Essentially in NamesAndTypes you add an entry for each channel, and tell CP what's unique in each image's name or extracted metadata to help it assign the images into "sets" (ie "DAPI" images contain "ch01.tif", "GFP" images contain "ch02.tif", etc)- the help article goes into it in more detail.
The Group module is something separate- it's mostly relevant when you have many images that need to be sorted into discrete analysis runs (ie tracking objects between each frame of a given movie but then starting fresh when a new movie is loaded, calculating per-plate or per-well averages, etc). Again, this will be covered in the help section.