Did the German army had reserve battalion in company formation during WW2?

Answer 1

A battalion is larger than a company. The German divisions had training and replacement battalions from which it pooled replacements. They were referred to as Ausbildung und ersatz battalion (or abteilung).
There was a reserve army referred to as Landeschutzen Division which was equivalent to the American National Guard or the British Territorial Army. During war these were mobilized into the regular German Army structure and depending on the age of the NCO's and Officers and the ratio of younger enlisted men would be assigner to front. Some divisions were used as security or garrison divisions others were reinforced with younger recruits and Officers from the active army and used as front line fighting divisions.

Answer 2

not in the same sens as in the WW I where they used the reserve regiments at the front side by side with the active units.
In the second WW the reserve units where placed all over Germany at camps and they acted as a supply basis of the active unit at the front.
The active unit had not specially a reserve unit but they could in time of need pull some men out of the staff and the supply train