The SolusVM Automatic Reinstall option does not allow you to modify or create a custom partition but you can manually install an OS by following these instructions:
Login to your SolusVM Control Panel.
If you have multiple VPS’, select the appropriate one.

Scroll down, and under the
Settingstab, change the boot order to (1) CDROM (2) Hard Disk.
Now click on CDROM tab if the CD-ROM is already mounted. Click on the unmount and then select your operating system from the list. Then click on
Mount.
Reboot your VPS by clicking on
Rebootand it will show a confirmation window. Then click onYes.
Now quickly click on VNC without waiting.

The new VNC page will open. Click on
Java VNC Clientor on theVNCbutton.
It will prompt for confirmation. Click on
OKorContinueand it will show “Security Warning”. Accept it and clickRun.
Most operating systems will ask you to “Press any button to start OS installation”. While booting, you need to press any key on your keyboard when asked and the OS installation/Reinstallation will begin. It may also show you an option like
Installation OS,Test This Media. For OS installation/reinstallation you need to selectInstall OSand then press theEnterbutton.
Once the installation begins, it will setup the OS and ask you to create partitions, set root/admin passwords, etc.
After the installation is complete, don’t forget to set your VPS boot order to (1) Hard Disk (2) CDROM. Otherwise it will reboot your VPS and start in installation mode instead of normal mode.