Thanks George!!! Sometimes things are easier than they seem!!!
Just give those additional fields the same name as the original and they
will automatically have the same value.
Your script will not work because it is using methods created for browsers,
not for Acrobat.
When the fields are given the same name it appears as if they have the same "Read Only" status toggle. Can I give fields the same name but only have one, i.e., the master, be an editable field while the rest are read only?
Nope. But what you can do is give the read-only fields a different name, and in the master field use a script like the following in the Validate event to copy the value to the other read-only fields:
getField("other_field").value = event.value;
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