To view and copy lesson plans from a colleague, first log into your account. Pull up your planbook in one tab, and then open a second tab and go to your group and then select your colleague’s planbook.
Then view your colleague’s lesson plans. Select the lesson plan you want to copy, go to the lesson menu, and select "Copy." Then go to your planbook and select "Paste" in the lesson plan menu for the day and class you want to paste the lesson.
Note: This video shows planbooks from the old version of Cc. Things are laid out slightly differently in Cc 4.0, but the concept is the same.