No - everyone in one group only!!!
A few years back I introduced a couple of more distant friends to my normal ticket groups and they made up a 6 with another 4. We got through to the booking page last minute and entered 6 x reg numbers and postcodes the page flagged an error: the 2 people I'd added to the group had already got tickets against their numbers as they were also in another group.
After a bit of faff removing them and trying again they'd sold out and the 4 originals didn't get tickets.
To add insult to injury, those 2 didn't pay their ticket balances because they didn't fancy the lineup! But the other 4 did get them in the resale, thankfully.
As someone who has never gotten through before and always relied on someone being the lucky one; do you have to input all registration details like name, number and postcode if you get through? Or is it just registration number and postcode?