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I've come across both of the following:
Woher haben Sie das?
Wo haben Sie das her?
I assume both sentences mean the same thing (Where did you get that from?). Do they differ in any other way (e.g. register, dialect)?
Curiously, at least judging by the number of Google results,
Woher wissen Sie das?
…is far more common than
Wo wissen Sie das her?
You have simply encountered two different verbs:
"haben" is a common non-separable German Verb (and an auxiliary) in standard German. And if you are asking "where from" someone has acquired something, you would ask
Woher haben sie das?
"herhaben" is a separable verb listed by some dictionaries as regional and/or colloquial. Even if it is colloquial, its usage must follow standard German rules, such as that in questions the separable prefix moves to the end of the sentence. This ends up in your second form
Wo haben Sie das her?
The lower frequency in Google results simply reflects the fact that this form is considered colloquial.
This is a difficile topic.
There are differences, but not in "direct" (core) meaning, rather in - as you correctly suppose - register and the situation where you would, could or should use those sentences.
Wo haben Sie das her?
and
Woher haben Sie das?
when used with reference to some object (a book, a picture, a piece of clothing) or possibly also some kind of a disease or infection (in a situation where people speak about something like this) can be used quite interchangeably, without too much difference in register.
Whereas
Woher wissen Sie das?
and
Wo wissen Sie das her?
are clearly different. The first one would be the standard expression as it could be found also in a textbook for learning German. The second, though, sounds very sloppy, informal, berhaps even rude or provocative, at least in my personal perception (native speaker, professional writer, a bit of linguistic background). Perhaps it sounds more rude because it is so unusual, and so when you hear or read it, you imagine a not so well-educated person speaking... ?
Generally, I would say, the "Woher" form tends to be more polite, and the "Wo xxxx her" form tends to be a bit more aggressive or intensive.
A note on dialects
Initially I thought dialect was not a factor here. But when thinking more about it, I find that
Wo wisset Sie dees hääär?
would be a typical form of speaking in the Swabian region (whose dialect I have deeper insight into) although
Wohär wisset Sie des?
would be similarly likely.
So, finally, I cannot exclude that there are different habits in different regions of the German speaking world regarding the everyday use of the two constructions.
