Import bookmarks from Google Chrome
How to import bookmarks from Google Chrome in Opera 23?
Copy the bookmarks file from the Chrome profile into the Opera profile. You can find the location of the Opera profile on your computer by going to the Opera Menu, and clicking on About Opera.
If you want to wait, it's possible Opera 24 will have an import feature that will make it easier. Perhaps, people using Opera Next can comment on the progress of the import feature, and whether it will be in Opera 24.