Identify duplicates between 2 columns

[diveshop]

I have a column (A) with a list of say 500 names. I then copy & paste a seperate list in column B of 20 names. I need to then scroll 1 by 1 in column A to find each name listed in column B & then delete it in column A. (very tedious). How do I get excel to identify these new names in column B & find & highlight or automatically delete them in column A. eg
A B
Peter john
mary andre
elly steve
simon mary

Instead of scrolling down list A to find "mary", I need "mary" in column A to be highlighted or preferably automatically deleted.

Please help ... I am a beginner

Andre

 

[Andrew Poulsom]

This formula:

=ISNUMBER(MATCH(A1,B$1:B$20,FALSE))

will return TRUE if the name in A1 is in the range B1:B20. Enter it in say C1 and copy down as far as necessary. If you AutoFilter the data for column C = TRUE you will see which rows to delete.

 

[diveshop]

Thanx Andrew, much appreciated