Newbie to ARIBA: Query about Organization Structure

Hi All

I am new to ARIBA. I have a background in SAP and is looking for some guidance .

Is there a concept of organization structure in ARIBA like the same we have for SAP ?

If yes how do we design and develop organization structure in Ariba ?

How do we Create, upload and Setting up of Organization structure in Ariba for Sourcing, Procurement & Catalog process ?

If no, what we need to do for setting up for Sourcing, Procurement & Catalog processes ?

Please help. In case you have any documentation, please redirect me to the same.

Thanks