aggregate data

#1
I have a survey (which I did not create!) where a particular question has 22 possible categorical answers. And when someone clicks on an answer, more subcategories were available from which to choose from.

The problem is: in the SPSS dataset, from this one question, 43 variables were made (because of all the categories and subcategories). And now I´m supposed to put them all in one single variable, how can one do that? On top of everything it´s a multiple response question…

All help will be greatly appreciated