Are you able to create the necessary named selections (based on body) and send it to Fluent where you should be able to add the materials?
You will need to create separate named selections (volume-based) for each of the regions - casing walls, outer fluid (water), steel pipes, inner fluid region (PCM), and anything else (if you have).
You will not be able to group the same body twice in different named selections. Fluent will not be able to recognize this.
I'm not sure if that helps. If it does not, could you please elaborate some more (with additional images) on what Fluent is reading.
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