Focus fire has a very nice picture explaining it all on page 19 of the big rule book, and that takes extra care to state that you have permission to target units out in the open using focus fire. The way this works is fairly simple; when you announce you plan to focus your fire you need to state up to what level of cover save you are intending to ignore. Any unit in cover with a number that is equal or worse then to the value you state are able to be assigned wounds like normal. Therefore, if you state you are firing at 5+ cover saves, this means you are firing at 5+, 6+ and - cover saves as well.
As units that are out in the open get - for their cover save, so they are always capable of being hit with any focus fire declaration.
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