It would be helpful to know what you want to accomplish - to understand your reasons for wanting to have multiple partitions set up in a certain manner.
I am not a openSUSE expert but I have been using multiple partitions and operating systems for twenty years and this is how I understand it:
Separating the operating system from applications and data is better because:
1.- OS’s must be updated or re-installed and can become corrupted;
2.- The size of a partition required for an OS can be calculated more easily than for the other two, since a user may want to install any number, size and type of applications at any time (and are usually installed to the /home partitions, when one exists), so you can avoid running out of operating system space by having a home partition; and
3.- The same Data can be shared using multiple OS’s.
So I have always tried to maintain my data on partitions that could be accessed by any OS, separate from the OS’s and applications.
That means at least 3 separate partitions should be created (aside from Swap and perhaps, boot) and particularly, a separate data partition (which is the most valuable part of a computer and is what you most need to back up.
Disk partitioning - Wikipedia, the free encyclopedia
Talks about some of that. And
List of disk partitioning software - Wikipedia, the free encyclopedia
Mentions some of tools to partition with (including gparted).
I am assuming that your reasons are similar to mine, and I generally make my home partition twice as big as the root /. And with Linux, none of them have to primary partitions.