Dubbing units are unique in IKP. No one is assigned to a certain group. So anyone could dub anything. We have five primary dubbing groups.

IroKokoro Project- The name of the  full group
Fuantei— Morning Musume
(Ranges 5 + people)

Bishoujo—- Berryz工房 and ℃-ute
(Ranges 5- 9 People)

Amai—- Shugo Chara! units (Buono!, Guardians 4, Shugo Chara Egg), Kirarian Revolution and S/mileage
(Ranges 3 or 4)

—- Misc. Units, Shuffles, Melon Kinenbi, SweetS, Minimoni, Tanpopo, Petitmoni, Other H!P Units and other Japanese groups.
(Ranges 2 +)
(Ranges 5 to 10)