Dalek Council

The Dalek Council was the governing body of the Daleks on Skaro.

History
They convened in chambers on the fourth Level of the City. They were presumably destroyed when their power was drained away. (TV: The Daleks)

It seemed to have survived and was present when the Daleks tried to win the Great War. The Dalek Emperor and the Supreme Council determined that the Dalek Factor had to be researched so they could recondition humans with Dalek mentality throughout their history, potentially preventing the wars from ever happening. A Red Dalek acted as an emissary for the Council, overlooking the experiment being carried out by the blackmailed Second Doctor on Earth in 1866. (PROSE: The Evil of the Daleks)

Some time after the Daleks recovered from the resulting Dalek Civil War, (TV: The Evil of the Daleks) a Dalek Supreme with a gold and black casing was identified as "one of the Supreme Council". (TV: Planet of the Daleks)

The Supreme Council dwindled down more and over over the course of the Dalek Wars, until it was whittled down to a singular Supreme Dalek (PROSE:  The Astounding Untold History of the Greatest Enemies of the Universe) who orchestrated the Daleks' master plan on Kembel. (TV: The Daleks' Master Plan)

In a later stage of the New Dalek Paradigm's history, the Dalek Council appeared to have been replaced by the Parliament of the Daleks, led by the Dalek Prime Minister, then the Supreme Dalek below him, along with one Strategist Dalek, hundreds of Officer class Drone Daleks, and thousands of drones of a design resembling those from the Last Great Time War. (TV: Asylum of the Daleks)

Alternate timelines
In one alternate timeline in which the Daleks invaded Earth in the 22nd century after a series of devastating wars, the Gold Dalek, the Black Dalek and their aids formed the High Council of the Daleks in Earth Sector One. (PROSE: Doctor Who and the Day of the Daleks)

In another alternate timeline where the New Dalek Paradigm conquered Earth in 1963, the Supreme Council Chambers were located in Kaalann. (GAME: City of the Daleks)

Behind the scenes

 * According to The Dalek Handbook, a non-narrative source, the Daleks established a Council during their recovery after the Great Civil War on Skaro.
 * According to Aliens and Enemies, a non-narrative source, the Dalek Emperor's Personal Guard made up the "High Council of Daleks", of which the Dalek Supreme was also a member.