change input field to relational

Summary I have two many to one fields. But they were created differently. One of them was Input, Long Integer field and added relations from another table. Second field was created as many to one and it works both directions. <img width="816" alt="1" src=" Is it possible to change input field to many to one field in order to have similar functionality in GUI? <img width="824" alt="2" src=" Basic Example _No response_ Motivation The only option I see is to create another field and copy all data. But there are a lot of entries and a lot of relations. I would like to have a simple and safe solution. Detailed Design Data model->Fields and Layouts press ... and have additional option to "convert field to" Requirements List Must Have: • A • B Should Have: • C Could Have: • D Won't Have: • E Drawbacks • Alternatives • Adoption Strategy …