I don't think so, but somebody will correct me if I'm wrong. I believe your vacation weeks are locked together as-bid, unless divided by two bid periods. Then as stated by another poster above, it is possible to break them apart via a slide within the month each portion resides. But there is a work-around; you can use "Vacation Anytime" with other carefully considered bid commands to achieve a desired result. Prudent placing of Prefer Days Off and Award Bids can manipulate a result that will place flying where some of your vacation presently falls, while keeping the days off you actually need. Of course a certain amount of seniority is required to have positive results, especially if your already-awarded vacation covers a holiday or other time that would be popular for senior pilots to have off. Think of Vacation Anytime as floating credit (45.5 hours for two weeks). Depending on what fleet you're on, a single five day trip could take you into the LCW, or for max pay, something like a three day and a four day. The flying you seek will be placed where it needs to be, and the vacation credit days will be distributed elsewhere (there's a logic that's been published, but I don't recall exactly how the vacation is placed). Due to the uncertainties of placement, be careful if you are trying to keep a block of days open for PCS activity and extra $$ (like the beginning/end of the month. But if you think it through, there are a lot of options.