Dharmottara

According to the Vishnu Dharmottara Puranam, there is a composite form of Sriman Narayana, with all the aforesaid four moorties in a single body, having four faces and eight arms, mounted on Garuda. The face of this Lord presented to the viewer is in a beautiful human form, representing Vaasudeva, while the face to the right is leonine, that of Nrisimha (symbolizing Sankarshana). The face to the left is that of a beautiful boar (Varaaha), standing for Pradyumna, while the face to the back is terrifying in aspect and tawny-red in colour (raudram), representing Aniruddha. Each of the four Vyooha moorties brings forth three other forms, known as Vyoohaantaraas—

1. From Vaasudeva– Kesava, Narayana and Madhava,
2. From Sankarshana –Govinda, Vishnu and Madhusudana
3. From Pradyumna— Trivikrama, Vaamana and Sridhara
4. From Aniruddha— Hrishikesa, Padmanabha and Damodara.

It is also said that the four Vyooha moorties are responsible for the ten avataaraas (known as the Vibhava avataras)—

1. Vaasudeva for Vaamana and Krishna,
2. Sankarshana for Matsya, Koorma, Rama, Balarama and Kalki,
3. Pradyumna for Buddha and
4. Aniruddha for Varaaha and Nrisimha

https://www.google.com/search?q=Vishnudharmottara