I have created a demo spreadsheet to help explain.
(This is a small set of example data, the real set has more values [and the data may or may not be there from week to week])
I will have a static list of dimension values (in the example it is Source/Medium values) in the Report sheet. I want to compare the performance of a metric from week to week (Pageviews per Visit in the example)
Wanting to automate the getting of the appropriate values from Sheet1 and populate the Report sheet's corresponding empty cells with them
For example, cell B2 of the Report sheet would contain the value 6.05, and so on