Thanks Max. I'm not sure if I conveyed the message properly. What I meant by 'multiple notebooks in a stack' is having multiple levels of notebooks. When I do 'right click' on a notebook it gives the option of adding the notebook at the top level 'notebook'. NB1 | +----NB2 .......| .......+----NB3 ............. | ..............+----NB4 (ignore the dots, I had to insert there to get the right format) I know following works: NB1 | +---- NB2 | +---- NB3 | +---- NB4 Thanks Mahesh