Guru Gobind Singh had ordered Sikhs to accept Guru Granth Sahib as living Guru after him.
SGPC approved SRM (1927-1945) again endorses only one Granth “ Sri Guru Granth Sahib Ji” for the Sikhs. Sikh Reht Maryada(THE CODE OF SIKH CONDUCT AND CONVENTIONS)Section Three,CHAPTER IV Joining the congregation for understanding of and reflecting on Gurbani Article V(e) “No book should he installed like and at par with the Guru Granth Sahib”.10th Guru Ji Sanctified ( gave Gur Gadhi) only to Guru Granth sahib Ji . Therefore, Dasam Granth Parkash Cannot be done parallel to SGGS

Sikh Nation has only One Granth (Sri Guru Granth sahib Ji),One Panth and One Guru Panth approved Rehat Maryada.