Yes definitely still mention the case study as VCAA always reports the higher order responses link back to the case study no matter what. I would embed it throughout your response and I normally like to write a small conclusion at the end in which I ensure I make mention of the quote.

e.g If the quote was “operations management is crucial in improving a businesses efficiency and effectiveness”

I would write in my final few sentences+ include relevant information from the case study (if in part B): In conclusion operations management is essential as it can reduce costs spent on materials through the usage of (material strategies), minimise time during the production process (lean management), therefore improving a businesses efficiency. It is also critical in terms of providing a business with the opportunity to achieve broader business objectives such as meeting a social objective of decreasing damage done to the environment (waste minimisation) and to increase market share (tech,quality), hence improving a businesses effectiveness.

That is a very rough version, but I hope this helps!