How do I add/extend volume to C drive?

[Multisoulify]

So I want to add/extend two disk into one:
Disk 2 to Disk 0 (I want to extend C drive)
Disk 3 to Disk 1 (I want to extend D drive)
Can I add them without formatting C/D drive?

Here is the screenshot

 

[JohnPC]

Hello-
I use a program called Paragon Disk Manager for all my HD tinkering. I'd make new partitions on the raw disks of the size you want, then clone the existing C / D onto the new partitions (or backup and restore to the new target partitions.) You might have to reset your BIOS to correspond to the new boot drive, but that's not too difficult (Press DEL / F11 at boot.) Then, you'd have the partitions (drives) like you want them, and also have backups too if you kept the old partitions.
Regards