Repeating IF?

Hi,

I wonder if anyone can help me, on the attached spreadsheet there is a list of codes for different divisions which I need to group together in one cell separated by |. Obviously this can be easily done but I need for anyone divisions with "not quoted" to be skipped out without leaving a space or anything. An example of how I want it to look is on the right under the title "Answer needed for the system in 1 column". I've had a go (in green) but don't know how to get the IF to repeat itself. Does anybody know how to do it either this way or another way? I will eventually need to apply it to a large amount of data. Please let me know if this doesn't make sense.

Thanks in advance for any help you can give me.