How to remove back round noise from vocal stem

What kind of noise are you talking about? If it's just background hiss, that's very easily reduced with any number of plugins. In Reaper, there is REAFir. You basically sample the noise, and the plugin will cut the noise out. Waves makes a plug in series called Clarity. Izotope had RX10

If you're talking about things like doors closing or steps, some of those can be removed by finding the wave for that sound and manually cut it.
 
Trimming out sound before or after the start of a vocal is pretty easy. Removing noise from a part of the file where the vocal IS singing, that's a lot harder. There are noise reduction plugins but Ive rately found them transparent for steadty state hiss, and they're not very good for one off things - a door closing, footsteps, that kind of thing. For discrete noise like this, I've had some success with spectral editing in Reaper - a guitarist breathing audibly while playing a quiet acoustic part, for example, and it works maybe a ittle better because you're only modifying very narrow windows at a time - but here too there are limits.

If at all possible, just focusing as much as you can on noise reduction up front, before recording, and capturing as little noise as possible on the way end, really helps. What you can do with technology really is impressive... but the best results always seem like they come from just not capturing noise in the first place.
 
How do I remove unwanted noise from vocal track?
One way is to duplicate the track then null out the noise - another is surgicaly cut it out with Parametrics, Compression and other filtering - another way is to use RX11 and attack the noise headon - as @TalismanRich noted - what kind of noise (s)?
 
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