Sort on a calculation field--which need not be visible in the portal.
One possibility, assuming that you want to sort by date in ascending order:
Case ( TextField = "Introduction" ; Date ( 1; 1; 1 ) ;
TextField = "Conclusion" ; Get ( CurrentDate ) + 100000 ; // this is date over 200 years into the future...
Select "date" as the result type.
If choosing portal sort by name (like 01., 02. .... ) would negative values come before positive if I used in as case statement?
Case ( TextField = "Introduction" ; -5 ;
TextField = "Conclusion" ; 900000
If Number is selected as your result type, yes, this becomes another way to get the same result.
Thanks make a lot of sense!