I had two system in my office (Linn Klimax DS/3) and my home (Auralic Aries G2.1).
And I just bought a nucleus and lifetime coupon days ago.
Can I set the nucleus at home and let the Klimax get access to the Roon core?
Or set it in my office is better? (because I listen musics via Auralic lightening DS now)
Or I need a portable roon core such as Mac mini?
1 subscription = 1 roon core. You can either use Arc in the office or get another subscription. Or carry the core around if you feel so inclined. 
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Can Roon ARC control the Linn Klimax DS/3 ?
I thought it can only control the carplay or the smart phone
You can airplay to it but nothing else.
You need to use a VPN to work outside of where the server is. Roon don’t officially support this but others have made it work but it requires a good amount of network knowledge to work fully as Roons discovery protocols do not go over vpn traffic without extra configuration.
Having server on a laptop and take it with you will work to. You can switch license to that and back to Nucleus but they will be separate servers and not keep your history from both sites unless you back and restore each time which if everyday isn’t practical and you need music available to both.
Other option is arc and connect phone to usb in on the Linn I believe they have one. Then you can hires via arc.
1 concurrent core. It would als be possible to set up a second core and use the same license with it, just not at the same time
Is it complicated or time wasting for each connection to the different core?
The most annoying thing is that the databases of the two cores will be independent, so they will drift apart over time, unless you manually save a backup on one core and restore it on the other.
I mainly intended to point out that a license is not actually linked to one core permanently
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Time wasting yes, if you want to keep the one database as you need to backup and restore each time you move the server to the other machine if you want them in sync and maintain play histories, library alterations etc… Its not really practical if your doing it regularly. You will spend several hours dependant on your library size sorting it out. ARC is Roons portable solution and what I would use, music in gthe office is background if working so Airplay is fine for this or as I said you could hook it up via USB to the Linn. Or ditch the Nucleus and just have server on laptop only, then you can move that and the music with you where ever you go.
Maybe this post will help you…
This is too hard for me…
I prefer a laptop, e.g. Macbook or Mac mini, as a core…
First, Linn Klimax DS does not have USB port…so Airplay is not available, and Roon ARC either.
Is the Home setup and the Office setup at the same physical location with 2 different LANs or 2 different physical locations?
–MD
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Physically different place.
My office is far away from my home.
Then if you don’t want to have two Roon Servers (one at home and one in the office) and transfer your licence between them, or use ARC, put Roon (which will also include Roon Server) on a laptop and take it with you…
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Install Roon on a laptop to use at your office. Use your Roon Nucleus at home. It takes just a few seconds to deactivate one Roon server in the process of activating the other one.
The only issue with this is keeping the two Roon servers sync’d if that is important to you. The way to do that is backup one onto a USB HDD and use that to restore the other one.
Or, you can do what I did and purchase a second Roon subscription on your single Roon account. This will automatically keep Tidal and Qobuz in sync, but you’ll still need to manually sync your local music files.
With two licenses, does it keep ratings and other things in sync?
It’s just the actual music files that need manual syncing (the flac, etc)?
With two Roon licenses and one Roon account, Roon does not actually keep anything in sync. However, Tidal and Qobuz will stay in sync on both Roon licenses assuming you have only one Tidal account and/or one Qobuz account linked to both Roon licenses. To keep other things in sync, you would need to do a backup and restore from one server to the other. I don’t do that because it’s not important to me.
No as they are two different databases. There is no proper way to maintain two installs of Roon in sync without manual intervention and then you have to use on database between each machine. This then negates needing two licenses as you just keep one active at any time and backup/restore between them. It’s clunky and not very practical. Don’t think they really thought that people would want multiple servers all keeping the same data. Arc I guess is their compromise but is very limited in what it can do.