online shop - selling several courses to one buyer

[lutherblissett]

I want to build an e-commerce site where we will be selling trainings courses (that the buyer would have to attend in person, they are not online courses).
In some cases, the buyer will have the option to buy 5 courses with a discount, for himself and other 4 colleagues.
The problem is, I guess when one buys he has to fill in his personal details. But in this case there would be a way to make a required step for him to fill in the details of all the other people as well?

I am currently using Virtuemart and apparently there is no way to do that.
Is there a way to achieve that with some other extension?

Thanks