HELP! I have an interview next week to 'solve a problem' in sourcing - I've never done anything like this and don't have a lot of experience, really need help

Hi there. I currently work in category management for Grocery retail and I'm interviewing for a very different job still category management but not in retail, and more focused on sourcing and supply chain. I got past the first 2 interview stages and the next (and i hope last) one is I'll be presented with a 'case study' of a problem to solve, most likely related to sourcing. I don't have a huge amount of experience here because we have a sourcing team and I don't want to ask them for advice otherwise they will know I want to leave the company. Does anyone have any idea of some example 'problems' they might come up with and how I go about solving them on pen and paper? Any help is MUCH APPRECIATED!!! Thank you thank you

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