In a certain code language, 'FIND' is written as 'CLFB' and 'HOW' is written as 'VME'. How will 'WILL' be written in that same language?

Let's analyze the shifting pattern by checking the letters in reverse order:
For 'FIND' $\to$ 'CLFB':

* Last letter D (4) $\stackrel{-1}{\to }$ First letter of code C (3)
* Third letter N (14) $\stackrel{-2}{\to }$ Second letter of code L (12)
* Second letter I (9) $\stackrel{-3}{\to }$ Third letter of code F (6)
* First letter F (6) $\stackrel{-4}{\to }$ Fourth letter of code B (2)
The pattern is reverse order subtraction: $-1,-2,-3,-4$.

Let's verify with 'HOW' $\to$ 'VME':

* W (23) $\stackrel{-1}{\to }$ V (22)
* O (15) $\stackrel{-2}{\to }$ M (13)
* H (8) $\stackrel{-3}{\to }$ E (5)

Applying the same logic to 'WILL':

* Last letter L (12) $\stackrel{-1}{\to }$ K (11)
* Third letter L (12) $\stackrel{-2}{\to }$ J (10)
* Second letter I (9) $\stackrel{-3}{\to }$ F (6)
* First letter W (23) $\stackrel{-4}{\to }$ S (19)

Thus, 'WILL' is written as 'KJFS'.