OB West explained

Oberbefehlshaber West (German: initials OB West), German for "Commander-in-Chief in the West") was the overall commander of the Westheer, the German armed forces on the Western Front during World War II. It was directly subordinate to the Oberkommando der Wehrmacht (the German armed forces High Command). The area under the command of the OB West varied as the war progressed. At its farthest extent it reached the French Atlantic coast. By the end of World War II in Europe it was reduced to commanding troops in Bavaria.

Order of battle from June 1944 to January 1945

OB West
Army Group BPanzer Group WestArmy Group G Army Group HArmy Group D
Seventh Army Fifteenth Army Sixth SS Panzer Army(Dec 1944-Jan 1945) Fifth Panzer Army25th ArmyStructure of the OB West
LXXXIV Corps LXXXVIII CorpsI SS Panzer CorpsXII CorpsLXII CorpsII Parachute CorpsXXX Corps
LXXXVIII CorpsII SS Panzer CorpsXLVII Panzer CorpsXXIV CorpsLXXXV CorpsLXXXVI Corps
LIII Corps(Dec 1944) LXXXVI CorpsLXVII CorpsII SS Panzer CorpsLXXXV CorpsLXXXVI Corps

References