As part of the design process for the Group Booking module, we spent a fair amount of time ensuring that the import spreadsheet contains all the options you need to facilitate group booking requests, and is formatted so that it is easy to manage and maintain for general group bookings and to reproduce for rostered FIFO travel. I mean, just look at this!! Nice and simple - with a few bells and whistles thrown in to take the decision making process out.
Having said that though, if you already have a great roster file in place, or maybe some specific details are required on your output file for reporting requirements, don't let that be a showstopper. If you think there is no value in using the Groups module because of the time it will take to convert to these templates, think again... we may be able to customise a solution to fit your needs. So let us know before you start trying to reinvent the wheel.
Remember, even if it does take a little longer to manage a new booking file, the time you save after clicking [Submit] only once makes all the difference.