Athennian allows you to bulk replace a person from multiple offices across multiple entities, and here's how:
Navigate to the People tab;
Select the record of the person you would like to replace as a principal across multiple entities;
Navigate to the person's Interests tab;
Check of the box next to the affiliations you would like to modify;
In the blue banner that appears at the top of the screen, select the three dots at the far right of the banner and select Replace from the dropdown menu - notice that the Start Date and End Date fields are empty in the blue banner;
In the new window that pops up in the 1. Profile tab, select the Incoming Profile and the Start Date, and confirm the removal Reason and End Date;
In the 2. Address tab, select the address of the incoming profile;
In the 3. Review tab, confirm that the information is accurate, and then select Create - this will make the changes across the affiliated entities;
Notice the status of the outgoing principal is changed to Outgoing, and the status of the incoming principal is set to Incoming for all of the selected affiliations;
Follow the steps listed in the Generating Supporting Documents portion of this help article to generate the supporting documents for the removals in each of the entities.