Yes you can do that. It requires re-partioning the disk which can be done without disturbing anything but it is a bit of an unsafe procedure.
It might be easier to just move the system folders and leave the programs and OS alone.
The system folders that usually contain all your data such as Documents, Downloads, Picture, Music can all be moved . In file explorer you can right click each one of them, click properties and you will see a tab called location and a box showing where they are now. You can then move them to your D drive. ( which is part of the same disk. I have my Downloads folder moved to D: on my PC as my C is an SSD and only 256 GB.