In table 2, the percentage change was calculated separately for each category of A, B, and C. I'm using FME2022.
Table 1
Table 2

In table 2, the percentage change was calculated separately for each category of A, B, and C. I'm using FME2022.
Table 1
Table 2

Best answer by ebygomm
You should be able to do this with adjacent attribute mapping in an AttributeCreator

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