I don't speak much Italian, unfortunately, but from what I know, the word "molto" can have a variety of meanings, and will therefore require different translations depending on context, as well as on the function of this word in the sentence. Since you haven't specified any context in your question, I'll give you some frequently used options in Norwegian - with English translations:
Mye (much/a lot/a lot of)
(There are also many other ways to translate "molto" - these are just some examples.)
If you have a specific sentence in mind, I'll be happy to help you select the correct translation for your context.