Not without modifying the formula in A3. The filter options in 2007 were much improved over 2003. Your header indicates you have 2007 which is why I used it.
In 2003 use in A3 and copied down
Then filter column A for either "M" for month or "Q" for quarter.![]()
=IF(MONTH(B3)=MONTH(B4),"",IF(MOD(MONTH(B3),3)=0,"Q","M"))
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