Steve, In PE version 3, you cannot select all the presets at once. You have to bring them in one at a time. I haven't checked earlier versions.
Instead of exporting individual presets, you can select a preset folder and then export the folder as a preset. The preset file will then contain all the presets that were in the folder along with the name of the folder they were in.
When you go to import the presets, you have only one file to import, and it will create a folder automatically for you in the presets section. The folder will be named whatever you named it in your preset section on your computer. Then all ten presets will be in the folder.
By the way, thanks for the presets. I was planning on creating those myself at some time.