Clicking in a diff window to describe the process exactly...
Go to your list, click management
On left, there's 'manage categories', might have to scroll a bit to see it
In there, a button to create a category, and whether or not it is public
When you add lists, they are added to the bottom, but the order can be changed
When finished, click the words 'return to your list control panel'
Now you will see your list as a link on the left.
While looking at your 'main' list, you can edit the plants you want to include in your new list.
I found the easiest way is to right-click the little edit icon, choose "open in new window."
You will see a checkbox option now, to include it in the list you made.
Click that, then button 'save changes.'
Go through your main list that way, opening each plant in a new window to add to new list (that belongs on the new list) so you don't lose your place in the main list.
When finished, reload the main list page.
Now you will see the list name with the plants that were added to it.
And when you click the list name at the left, only those plants will be shown.
