Questions regarding Reorganization at the project and tasks levels

Summary:

Hi,

Due to a reorg, we have 170 projects on which we need to update the organization. Of course we also need to update all the projects' tasks. We have the following questions regarding the pages:

Manage Project and Task Organizations page.

Change Project and Task Organizations page.

Content (required):

Q1- The Manage Project and Task Organizations page allows me to update one project at a time, OR multiple projects if they are in the same organization. Am I right?

Q2- I am not sure what the Change Project and Task Organizations page does exactly, but it does not allow me to create batches!