I'll assume you have a date in column A of your report. I would add two
additional columns to your worksheet. The 1st beeing the weeknum. Add the
formula =WeekNum(A1) to the 1st new column and copy down the column. In the
2nd new column add the formula =Month(A1) and copy down the column. Then you
can add a autofilter to the two new columns (Data - filter - Autofilter).
You can then filter your speadsheet on either month or week num to get the
data. You can copy the worksheet to a new worksheet after applying a filter.