First of all, thanks for the answer.
If I press CTRL+D, it opens the font screen and I can't find "hidden" there or anywhere else. May this be an option not present in Word 2010?
Andriy Yasharov wrote:
There's a simple procedure in MS Word when you copy the source text into the target column so the source column matches the target one precisely. Then, select the entire source column, press Ctrl+D and check the option that says "Hidden". Save and exit the Word file. Now you can import the Word file into memoQ and memoQ will ignore the source column because it ignores any hidden text. You will be working on the target text only and the source one is going to stay intact. After translating the file, open the file, select the source column again, press Ctrl+D and uncheck "Hidden" option.