In Google Workspace, shared mailboxes are called "group mailboxes" and they can be created and managed using the Admin Console. Here are the steps to create and manage group mailboxes:

• Sign in to the Google Admin Console using your administrator account credentials.
• Click on the "Groups" tab to view a list of all groups in your organization.
• To create a new group mailbox, click the "+" button and enter the group's information, including name, email address, and group type (e.g. email distribution list or Google Group).
• In the "Group settings" section, select "All members of the group" under "Who can post messages" to allow all members of the group to send and receive emails from the shared mailbox.
• To add or remove members from the group mailbox, click on the group's name and then click the "Members" tab. Here, you can add or remove members by clicking the "+" or "-" button.
• To configure the group mailbox's settings, click on the group's name and then click the "Settings" tab. Here, you can modify settings such as who can join the group, who can post messages to the group, and whether the group is visible in the organization's directory.
• To manage the group mailbox's email settings, go to the "Email" tab. Here, you can configure email delivery settings, add aliases, and set up filters.

By using the Google Admin Console, you can efficiently create and manage group mailboxes within your organization, including adding or removing members, modifying settings, and managing email settings.