Hello.
Me again, this might be very easy to change.
In the beginnig, the group's name, it should be changed with company's name.
For example, we name the group's name, just call it A46.
One day we plan to build a new sister group, call it B46.
In reality, the idols from the new auditions will be placed in B46 directly.
But in the game, they will still be placed in A46, then we move them to B46.
It doesn't make sense.
We should get a company name first.
Each idol from the auditions will be a trainee in the company until the debut day.
Then we name the new group, and pick idols into it. Produce a singles. Congratulations! You are debut.
That's the meaning of group's name.