How to create a new menu field in custom object via PHP(Custom process)

Summary:

Hi Team,

I have configured two custom objects with the following fields.

Custom object 1 - x_abc: Community,building,floor (all are text fields)

Custom object 2 - x_123: Community, building,floor(all are menu fields)

Whenever the record is created in x_abc object and the same record to be created in x_123 object as well via CPM process. Already we maintain the menu fields in custom object x_123 but whenever the new values are created in the x_abc (text field), that value needs to be inserted as a menu field first and then it will create a record in the custom object x_123.