In new CC2018 LR, on any new import, LR is creating an entirely new set of folders on C drive under pictures. This is a pain in the a$$ and a stupid waste of disk space. I sometimes do shoots of 4-5K images in one shoot. I cannot find how to change it back to the way it used to be where LR just used the folder of the actual import. Why is LR creating a totally separate folder with dupes of ALL the raw files???
Actually the question is: why are you importing them to your hard drive first, and then importing them from there into Lightroom second? Just import them right into Lightroom, right from your SD card! It creates one set of folders, and imports them into your catalog all at once! Problem solved!
It sounds like your Import dialog's Destination panel settings are set to Organize by Date. Change that pop-up to Into One Folder instead, and make sure you set the destination to the right drive. There's a little more information here: https://www.lightroomqueen.com/import-destination-shoot-folders/
I shoot alot of sports. So I might have 3K-6K images and I put them on a large drive first to sort them. Then, I import the folder of the saved images into LR. Importing from a card is impossible because sorting that many images in LR is totally impossible. On old LR I would just drag the folder in and import the images...LR NEVER created a set of folders somewhere else...it used my import path and all the edits go that folder. I have nothing checked in File Handling other than not to import suspected duplicates...nothing in Destination is checked