Yes, and there are a few ways to do this. This question emphasizes why it is convenient for groups of employers to offer the same benefits to all employees transferring among the different employers. Reason being, it would be a complicated situation if an employer would have to take away a benefit from an employee that transferred, but technically still works for the same employer.
One way to do this is to indicate on the final document who each section applies to, for example in the vision section one could type “this section applies only to Employees of Acme Corp.”. Similarly, one may manually indicate in the Appendix which benefits apply to what employees. (e.g. Vision benefits apply only to employees of The Munster Corp.).