Extract Layout tool in Cadence Virtuoso

Hello

I am using Cadence Virtuoso version IC6.1.8-64b.500.6

I have a quesion about the "Extract Layout" from connectivity, in the option I would like to know the difference between the "Current Cellview" and the "Current and Cellviews in Hierarchy", 

In the options if I go for "Current Cellview"  I will have "Extract connectivity to level", does this represent the top or bottom level? how can I know the level number I am working on it

if I go for "Current and Cellviews in Hierarchy", I will have the option "Search Depth", I think here we give the bottom level?

Thank you

Regards