You could use the list function for this.
Define a calculation field as:
Substitute ( List ( TitleGroups::Title ) ; ¶ ; ", " )
Export this field instead of your portal.
This list will have the format: title1, title2, title3...
by modifying the calculation details you can get other formats or even combine several fields in the list.
Thank you so much for the calculation. It works great. Is there a book that you would recommend on how to write calculations for Filemaker Pro? I do not have training, so while I know the logic of what it is that I want to accomplish, I do not know how to translate that into a calculation.
I'm afraid I'm self taught--starting with a degree in computer science and a math minor.
I suggest researching a site like Amazon for books on filemaker, there are several offered, and looking at the reader reviews should help you decide which might be best.
There are also tutorials available, several other sites with filemaker forums, and you are welcome to continue posting questions here.