Scripting "Auto-Enter" Option

[Jarvis]

I have a database with a "Customer" field that (upon record creation)  automatically enters the customer's name from  from the previous record.

 

 

I would like to change this so that this field is empty upon creation but can populated with values of previous field upon hitting a button.

 

 

How would I write  a SET FIELD script that can populate field with contents of previous record?

 

[comment]

What exactly is "previous record"? It could mean the previous record in the current found set, or the previous record by creation order (requires a relationship), or something else. How exactly is your current auto-enter set up?

[Jarvis]

Thanks Comment.  Those are things I hadn't considered.

 

When I create a new record in this database the "found" set generally includes all of the records.

I probably mean the previous record by creation order.