Your organization's primary domain for Google Workspace is "mycompany.com," and it has recently acquired a startup that uses a different cloud provider with the domain "mystartup.com." The plan is to add all startup employees to the Google Workspace domain while retaining their current email addresses. The CEO of the startup has the email address andrea@mystartup.com, which is the same as your company's CEO email address, andrea@mycompany.com, even though they are different individuals. Both CEOs must continue to use their respective email addresses. Additionally, your manager has requested that all existing security policies be applied to the new employees without any duplication. What steps should you take to execute the migration?