This is what I do when I reformat my computer. I used to tri boot windows, debian, and openBSD but at the moment only windows. The process should be the same with suse
And resize your partition so that there is your windows partition and a blank partition. Once you do that you can create the linux partitions(usually 3-4) when you install linux.
You create the Master Boot Record during the linux installation process. The master boot record tells the computer which OS's are installed and in which one has priority over the rest. I use linux most often so gentoo has priority over windows and BSD. Which means it will boot first If I don't choose and OS.
This isn't the only way to do it but I found that It is easier to resize your windows partition and create a blank partition before you begin the linux installation. Than to do it during the installation.