Webi 4.0 and BW Hierarchy Key display

We have recently installed Business Objects 4.0.2 and have some questions about Webi 4.0 and reports based on SAP BW via BICS connection.

1. Is there a way to display the key of hierarchy in WEBI 4.0. Currently I only see the text for Cost centres.

Is there a settting that we need to change to control the display Key/Text.

2. Also Can we control the hierarchy level that we want to display.

Currently I do not see any control, It just displays the entire hierarchy.

What if my users do not want my users to see the details of the lower nodes of hierarchy.