How to pass field value to another field in the form?

How do I prepopulate a fill-in-the-blank field blank's value
with a default value where the default value is one of the field on the form?

For example: The default value should be the physician's name that was entered in field1.

It is possible to use conditions to pass the field value to another field.

Here is a guide:https://www.jotform.com/help/286-how-to-pass-field-value-to-another-field?

Please check it out and let us know if you need further assistance.