Cells with same contents
 

My spreadsheet has":

"Section 1": A1.N18513
"Section 2": O1.AC4841

If the contents of the cells in Col O match the contents of the cells
in Col A, I need to keep all of the cells in "Section 1" and all
of the cells in "Section 2".

The result would be:

One "section" containing the cells from COL A thru N and
One "section" containing the cells from COL O thru AC.

How can I do this?