Importing into lightroom

Copy as DNG – Images will be copied to a specified location in adobes universal DNG format.

Copy – images will be copied to a specific location in original file format
Move – images will be moved to a specific location in original file format
Add -  files will not be moved or copied. they will be added to light room catalog 

 The option "Make a Second Copy To" is available if you choose Copy as DNG, Copy, or Move as your import methods. It doesn't work with Add.

There are two subfolders that determine where your files are stored. First is the Into Subfolder option which lets Lightroom create subfolders for you and then theres a drop-down with two options: Organize by Date and Organize Into one Folder.