Partitioning & Boot up.

I have Suse 11.1 installed now. I want to install LinuxMint on a small 10-15 Gig Partition…Will I automatically be able to select what OS i want to boot into or do I need to set that up? When I had a XP/Suse It always promted me…

You should have a boot menu now. When you install Mint you either let it manage the grub boot menu or you see if you can find an option in the Mint installer for it not to install grub.
The latter would be my choice. And then I would manually add a Mint boot to the existing SUSE grub menu.