Mass Updates to Business Warehouse authorizations

Hi All.

First post here, forgive me if I commit any faux pas. =)

Need to update well over 1000 BW authorizations. The update will consist of adding a new node entry in the 0Profit Center entry. What's the best way to approach this? ECatt Script? I have no experience with ECatt's yet, but would like to. But is there a better way?

Thanks for any advice.