hi,

Generally phd course is of 3 to 4  years duration, students who have completed masters course on related discipline may apply for phd course on relevant subjects. however I have mentioned some tier 1 Institute name which offer phd course in commerce and management:

Rama University - Uttar Pradesh

Amity College of Commerce and Management , Uttar Pradesh

Amrita Vishwa Vidyapeetam ,Kerala

Al-Falah University , Haryana

Gujarat University , Gujarat

hope it would help.