I can't figure out how to parse?

Question

Macros

Good day to all! There is a task:
Excel file with several tables,
From one table old data to another new data
All have the same first id columns. And there are two other settings sheets with different data, they also have the first id column. The essence is to take data from two sheets for certain cells and rewrite it in a new table and add data from the settings sheets by id. There is a hint to use a script with this line
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It's not clear this is like an xml parser code (I understood this after stumbling upon a couple of foreign articles)
How to implement an xml script in an excel table using macros