Looking for duplicates and merging into a single row

[Battlecroft]

Hello all,
The problem I am trying to figure out is how to check to see if one variable is a duplicate, and if so, to merge the data of the duplicates into one row. I attached a sample of what I am doing. So, specifically what I want to do is check to see if "173" for example appears twice in nquest, and if so, to merge the rows so that there is only one 173, and in that row, nonoc is 0 and c is 19600. Also, if the number nquest is not a duplicate, I want to drop it. Thank you so much for your help and let me know if I need to explain it further.