Before I go on I will say that this is a bit advanced for a beginner and you could ruin what you have now. That being said if you like to play around and don't mind that, then take a look at this tutorial, it looks good for a beginner.
A Step By Step Guide To Installing openSUSE Linux
Once you post the Partition info we will see if you installed in GPT.
1. First we need some Free Space to install Opensuse if you haven't already, that you can do with Gparted, and you can use the OpenSuse disk if it has gparted included.
2. If you installed in MBR then you will want to create an "Extended" Partition first, inside the Free Space or Unallocated Space that you created in step one. This is because you can only have Four Primary Partitions on an MBR Drive, and we may exceed that with a dual boot system. It will also allow you to create more partitions later if needed.
3. If you installed in GPT, then you could just choose to install OpenSuse to the Unallocated Free Space that you created in step one. OpenSuse should automatically create Root, Swap and Home Partitions for you.
4. Please also Read This if you are moving forward.
1.2 Minimal System Installation