First, make sure all of your entries are the same for the week names. "Week 1" is not the same as "Week1" as you show in column D. (Change those to have spaces just like in A3, A8, A13 and A18 as well as in column G.) Also, in A18 remove anything after "Week 4".
The formula below is checking these cells for matches, and will result in an error if it's not finding true matches. This is an array formula which must be confirmed with CTRL+SHIFT+ENTER, not just ENTER.
Put that in B5 then copy to B10, B15, B20.
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