source cell: CCA, BF
result cell: C, CC, CCA, B, BF
CCA is a complex code relating to a hierarchy. It means, CCA is child of CC, which is child of C. So, the formula should split into all parents (C and CC) and keep the child (CCA) -- and do this for a concatenated list of strings. The current maximum of levels is four (ABCD) but might be more in the future.
I have no clue how to create a formula for this.
It's connected to the research data being part of https://raramagnetica.vercel.app/vikus/vismag/