Go to a big board you want to divide into smaller ones.
This is my "Bake, bake a little cake..."
Decide which pins you wish to move, and click on the edit pen in the upper right corner:
You will see something like this:
You do that by simply writing the name of the new board in "Create New Board" square. (Again, marked with a red arrow in my picture here, not on-line.)
I am going to move all my cake decoration ideas and pictures to a new board, to make my cake recipe board easier to handle, so I name the new board "Decorated cakes". After I have written the name in the square, I click on "Create", and Pinterest creates the new board.
Then I just click the "save changes" button below the picture:
This way I can edit the pins, add more information, change the URL (if I want to pin something that has no URL associated, or if I want to upload pictures straight from my computer, or if someone asks me to change the URL) etc.
If I want to organize pins, I move the pin from one board to another - it doesn't matter which - and then back to the board where I want it to be. The pin will now appear as last pinned, the first on the board. Unfortunately that's the only way - as for now - to arrange the pins. We hope Pinterest will make this easier. :-)