Hi,
Let me answer your question first, then give you more information than you asked for. Parallels 10 and Windows 8.1 64 on my 2014 MacbookPro mostly works.
I bought a 13" MacbookPro five months ago after many years of using Windows laptops. Because I expected that the wonderful world of Mac OS was going to be so foreign, and because I had one program (Quicken) that I had to run on Windows, I decided to also invest in Parallels, a most popular program that promises to make an Apple laptop perform exactly like a Windows laptop.
I have Windows 8.1 64 running inside of Parallels on my 2014 MacbookPro and it mostly works as advertised. I say mostly works because I have four problems which may or may not be related to the Windows applications. One, I experience on-going wifi connectivity problems when the laptop wakes up, which I assign to an elusive problem in OSX. My work around is to turn off, then turn on the wifi on the laptop. Most of the time, my connectivity is restored. I have eagerly installed every new patch to OSX, but no joy to date. Two, the battery drain is much faster when I am running the Parallels/Windows 8.1/Microsoft Office than when I am only using OSX applications. When running Parallels 10/Win 8.1 - 64bit, I estimate the battery monitor is reporting a decline of about 25%/hour. Running just OSX applications, battery life is at least twice as long. Three, dual monitor support does not recognize the second monitor in Windows when it works just fine on the OSX side. Four, I could not seem to get the MS Office Outlook client to configure correctly to my corporate Exchange email account. After several attempts, I just gave up and use the OSX Mail application which had no issues.
Here (finally) is my point: With the benefit of hindsight, I would have delayed buying the Parallels/Windows products and invested more effort using the stock Mac software. I found that the programs supplied as standard with the laptop (Mail, Numbers, Pages, and Keynote) were not too hard to become familiar with, and worked just fine at importing & exporting MS-Office files. The hardest thing to learn was how the OSX file directory structure (Finder) works, which still doesn't seem intuitive to me.
The Parallels/Windows route is expensive: I had to buy a license for the Parallels 10 ($67), a license for Windows 8.1 ($105), a license for Microsoft Office that includes Outlook ($67/year, ANNUAL SUBSCRIPTION!), and antivirus for the Windows environment ($36/year). The Parallels tech support team recommend protecting both the OSX and the Windows virtual machines, so you will need two instances of anti-virus.
On top of that, things don't quite work as I described above. I find it very hard to work through the support maze: Is the source of the problem in OSX? Parallels? Windows? or MS-Office? Also, the frequency and severity of patches for OSX, Parallels, and Windows surprises and concerns me. And the support window for Parallels is extremely short
Based on my experience, I would suggest trying hard to "go all in" on the Mac OS side. Cleaner is better.