In his mid-thirties, the 6th Karmapa went into a retreat where he clearly recognized that he did not have to live long. Karmapa decided to appoint Tashi Paljor Döndrub as his regent (= Gyaltsabpa) at the age of 14. The 1st Gyaltsab Rinpoche thus became one of the lineage holders of the Karma Kagyü lineage, (by hierarchical ranks: first, Shamar Rinpoche, second, Situ Rinpoche, third, Gyaltsab Rinpoche, and fourth, [since the late 19th century] Jamgön Kongtrul Rinpoche). They must ensure the continuity of the Kagyü transmission in the interim between the Karmapas’ incarnations.
He built his own monastery, Chogar Gong, directly behind the Tsurphu Monastery.