How to record Original Hire date for Rehires with initial data loading

Summary:

Content (required):

We are uploading Employees data using REST APIs, some of the Employees were rehired. We need to keep track of the Original Hire date without recording the old assignment and then termination.

Version (include the version you are using, if applicable):

22C

Code Snippet (add any code snippets that support your topic, if applicable):