Profit Centre Hierarchy Change and Profit Centre Budget

Hello Friends

For better view of Profit Centre Reports we are planing to change the Profit Centre Hierarchy.

I wanted to know that, are there some Specific Points which we have to take care of, before changing the Hierarchy?

Will some other settings get affected in System after changing the Hierarchy?

Also i want to know the TCode for entering Profit Centre Budget in System.

regards

prashant