Selecting the columns you want to combine and then choosing Cols->Utilities->Combine Columns... from the menu will give you a dialog box in which you can specify the new column name and then check the "Selected Columns are Indicator Columns" box. Clicking OK will create the column you are looking for. Note that if a row could have more than one "1" you should also check the "Multiple Response" box, in which case, the entry in the new column will be the column names concatenated by the character chosen for delimiter ("," is the default).
Hope this helps.
-Jerry