Hanafi
The sources give no view for it here.
طلاق بعض الزوجة
هل تطلق الزوجة إذا طلّق الزوج بعضها؟
Each school’s answer
In our wordsHanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
Not stated in the sources
The texts
مسألة: إذا طلق بعضها طلقت، خلافا لداود؛ لأنه مكلف تلفظ الطلاق لزوجته، فثبت حكمه، أصله إذا أضافه إلى جملتها أو النصف.
«الإشراف», al-Qadi Abd al-Wahhab p. 748
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
The sources give no view for it here.
What is «in our words» is our standard wording; the books’ texts stay as they are.