Tabʿīḍ: The permissibility of dividing taqlīd between more than one marjaʿ
From the Istifta’at (volume 1, page 43) of Grand Ayatullah Sayyid Muhammad Taqi al-Modarresi, may God prolong his life:
Question 22: I was following now-deceased Imam Sayyid Muhammad al-Shirazi, may God sanctify his grave, and my question is this: I have heard that you permit those following the rulings of the Late Imam to divide their taqlīd between yourself and Sayyid Sadiq al-Shirazi, may God preserve you both and lengthen your lives. What is your opinion about this issue, and am I able to do this?
Answer: Dividing taqlīd between more than one qualified mujtahid is allowed, on the condition that it is not based merely on one’s personal whims. And issues about this are addressed in the beginning of the risalat amaliyyah (of Sayyid Muhammad Taqi), Aḥkām al-ʿIbādāt.