Stellar Partition Manager is a well designed software that enables a user to create partition in a Mac system. To create a partition you can use Add Partition and follow these steps
Launch Stellar Partition Manager
and select the hard drive.
button on the toolbar; you find Add New Volume dialog box.
Specify volume name. To specify the size, move the slider.
Task to do list in the right pane allows you to view the newly added partitions.
Click Start to initiate the listed tasks.
A message pops up with a warning. Click Continue
after you are sure that important data has been backed up properly.
After the process completes, the newly added partition gets displayed in the middle pane along with the other partitions.