What is the difference between "herbei" and "her"? Is it right we say "herbei" is more formal?
The adverb of herbei is not very frequently used, it means "from there to here".
But of all occurrences I found on a quick glance, in more than 80% of the cases it was the separated particle of the verbs
Espcially herbeiführen has such a special meaning, that replacement by herführen is impossible.