In general, DLsite does not recommend having multiple circles.
However, if there is a specific reason you wish to have multiple circles (i.e. separating all-ages / adult-only), you can register multiple circles under the same representative.
In such a case, you can add another circle by following these steps.
1. Register your first circle, and login.
2. Go to Circle Management > [Change registered info/Add circle] > [Circle info/Add circle]
3. Click the [ Add Circle ] button.
Regarding Sales Proceeds
Sales proceeds will be calculated separately for each circle.
Proceeds that are carried over to the next month for payout (under 3,000 JPY for domestic Japanese or Taiwanese banks, under 30,000 JPY for international) will also be calculated on a per-circle basis.