First contract on me, which SF class?

Hello, my partner and I have purchased a Pampers bomber and this is to be insured fully. On the topic of SF class I am not getting through completely, the following situation: I took part in the driving licence since 2010 and also in the accompanied driving. Own car, as well as accident-free driving also since this time. The car is insured by my parents. With my partner the constellation is similar, driving licence since 2015 and also since time accident-free with own car The new station wagon should now be insured on me as the main insurance company and it. And here are the questions: Obviously I would get into SF 1/2. Okay is just like that. But what happens now in the following year? Is it really going on with SF1 etc. and the whole accident-free years are lost or will they be caught up and I would then be granted the accident-free time of 2010-today? From the previous contract of the existing cars we could where Hl at least take the previous SF class for these cars or if I understand correctly you could take the one for the new one and let the previous car start with 1/2? We are both insured with the same insurance, by the way, if that plays a role. Would be great if someone knows it and brings light into the dark- google makes me unfortunately not smarter… Thanks and lg