Are THE below sentences correct? My wife handed the document in to the company this morning. My wife brought the document in to the company this morning. My wife took the document in to the company this morning. The sentences are fine grammatically. You can also write: My wife handed IN the document to the company this morning. My wife brought IN the document to the company this morning. My wife took IN the document to the company this morning. These keep the “verb + in” together which is preferable if the object is long and complex. For example: My wife handed IN the document that she was supposed to hand in to the company this morning. The object is now “the document that she was supposed to hand in” so if you split “hand in” you get My wife handed the document that she was supposed to hand in IN to the company this morning. This is clearly awkward and we want to avoid constructions like “in in” whenever possible.

They all sound correct. Just make sure that you say “into” instead of “in to”.

These are all completely correct. Although (in the US) when you use the phrase "handed the document", it is more commonly used with a person. For example: My wife handed the document to the receptionist at the company this morning. Or, you could use it this way to sound more natural: My wife handed in the document to the company this morning.

Yes. "brought" and "took" are synonyms. "handed" is like the word "delivered". (Something leaving your hand to someone else's hand.) Ex: "She handed the baton to the next runner in the Summer Olympics relay race."

They are correct...but they describe a situation where a person went to visit the company in person. (At the office, for example) Is that what you mean?