Power Query compute a value based on previous row value

HI Hart1969 

Is each release one row or can be one release in multiple rows?

Have you thought about the following (should work if one release is one row)? 

1) Make sure that your list sorted ascending by release ID

2) create an index column (standard Power QUery function) -> now each row should have a unique numeric index

3) now create a custom column like previousIndex = [Index] -1 

4) now create a self join based on [previous index] and [index]

5) now you should have the previous list row in each row and you can expand the information you need for further transformation.

Best regards

Michael

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