Continous week number

In Query Editor, try this.  Add a custom column, and paste in this formula:

([Year] - List.Min(<Enter Previous Step Name Here>[Year])) * 53 + [Week Number]

This assumes 4 things.

1) You have a column called [Year] (modify the name in the formula needed)

2) You also have a column called [Week Number] (again, modify as needed)

3) There are always 53 weeks per year

4) [Week Number] is a column that always repeats from 1 to 53

The new column will not "reset" at 53, but will continue to increase.

Note, when you add the previous step name, it will need to follow this syntax:

if the previous step name is 

Changed Type

then write this:

#"Changed Type"

Basically, wrap it in quotes and throw a # in front of it.