i am on the right way?

Hi @Juergen72,

not quite sure if I can follow where your problem lies.
Could you maybe provide an example on how your input data looks and how the final output should look like?

I think for your supplement data with X you should look at:

For data summary you can look at the GroupBy Node:

For Excel Data loading look at:

For writing the final data to a new Excel check out the Excel Writer:

In general you can try to look in Nodepit or Knimehub for nodes you need (as well as examples using these nodes)
E.g. the basic examples from the KNIME colleagues: Examples — NodePit

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