At last! This great and expected feature is finally available in OneDrive! You can now select what folder and/or files to synchronize with your local computer.
Let’s say you have hundreds of GygaBytes in the cloud and need to work offline on a specific file. You only need to download the file you want to access locally. Just right-click the file and select the option”Always keep on this device”, the other files will be visible but not available offline.
Your files will appear with different icons, telling you if the file is downloaded to your computer or only available online.
For the near future this feature will only work for Windows 10 users, but certainly it will be available for other OS soon.
More information here