Easy. Open 3 tabs on the registration form. Fill in the info. Jump on tab with GT1 info and wait...
17:59:30 click... hmm doesn't work. Back (infos still there, no need to write it again
). 17:59:50 click... hmm still doesn't work. 18:00:00 click, team was added. Jump on GT2, NGT, click submit. Done.