Section 39(12) in The West Bengal Premises Tenancy Act, 1997
(12)The Controller may, at any stage of a proceeding, either on his own motion or upon the application of either party and on such terms as may appear to him to be just, order that the name of any party improperly joined be struck out and that the name of any person who ought to have been joined, whether as a petitioner or as an opposite party or whose presence before him may be necessary in order to enable him effectively and completely to adjudicate upon and settle all the questions involved in the proceedings, be added.
