Merge Multiple column into new column

G'Day to the list.

Have Columns J-O. Need to copy the data in each to these column to Column P
Need to do this to multiple rows. Data needs to be separated by commas.
J. CEPP OEM K.POC L. OEM M. OEM Assistant N.1. Den-Bldr Metro O. Private Result in Column P "CEPP OEM, POC, OEM, OEM Assistant, 1. Den-Bldr Metro, Private"
New User of Excel 2010. Tried to select rows and use the marge function, however it deletes my source data and copies only 1st data column into result column. Have looked at several tutorials (Google Search) but none of them achieve desired result.

I've attached a small spreadsheet and a jpeg of the spreadsheet for your review.

Thanks in advance.
dana