Question: How do I create a new list of alphabetically sorted duplicates using excel array formula?

Answer:

Excel array formula in C2:

Copy cell C2 and paste it down as far as necessary.

Named ranges
List1 (A2:A20)
What is named ranges?

How to implement array formula to your workbook
Change named ranges. If your duplicates list starts at, for example, F3. Change C1:$C$1 in the above formulas to F2:$F$2.

Download excel sample file for this tutorial.
how-to-extract-a-list-of-duplicates-sorted-a-to-z-from-a-column.xls
(Excel 97-2003 Workbook *.xls)

Functions in this article:

MATCH(lookup_value;lookup_array; [match_type]
Returns the relative position of an item in an array that matches a specified value

INDEX(array,row_num,[column_num])
Returns a value or reference of the cell at the intersection of a particular row and column, in a given range

COUNTIF(range,criteria)
Counts the number of cells within a range that meet the given condition

MIN(number1,[number2])
Returns the smallest number in a set of values. Ignores logical values and text

This blog article is one out of six articles on the same subject.

Extract a list of duplicates from a column using array formula in excel
Extract a list of duplicates from two columns combined using array formula in excel
Extract a list of duplicates from three columns combined using array formula in excel
Extract a list of alphabetically sorted duplicates from a column in excel
Filter duplicates from two columns combined and sort from A to Z using array formula in excel
Extract duplicates from a range using excel 2007 array formula