recently purchased a new computer, running programs off a 250gb ssd with a 2tb storage hd
I've installed lightroom CC, placed my catalogs on my D drive (2tb storage) aswell as my file handling caches.
but for some reason lightroom when I import my photos takes up my C drive space?
The location of the catalog has nothing to do with where LR copies files when you import. During import, you tell LR where to copy the files if you use the 'Copy' option of the import process.
You can move entire folders with all files to the D drive from withing LR by drag and drop.
It is up to you the user to tell LR where to place the images you are importing. On the right side of the import dialog is a section called Destination. In that section you select the Drive and the folder along with if you want the images place into One folder, into dated folders and or whatever you like.