Pasting Multi-line Text as Multiple Cells
 
When you paste text into a page, NoteBook places that text into a single new cell.  Choose Edit → Paste → Paste Text as an Outline to divide the text into multiple lines, each placed in its own new cell.
 

NoteBook creates a new cell for every Return character in the text, and indents each new cell by the number of tabs at the beginning of each line.