To appoint a person to multiple entities at once, navigate to the People tab, select the record of the person you would like to appoint to multiple entities, and navigate to that person's Interests tab. Click on the + New button at the top of the screen to create the new affiliations.
A new window will pop up prompting you to enter the information on the entities for which you would like to appoint the person, as well as his titles and address.
Add as many entities as you'd like in the 2. Entities section by selecting + Entity and choosing the entities. Following this, navigate through the remaining sections (3. Titles, 4. Address, and 5. Review) and enter the required information. You can follow the instructions provided in this help doc to help you enter the election/appointment information. Click