Can i create a single list box based on multiple columns?

[Anonymous]

how do I create a single list box from the column values of multiple columns

please let me know

[Anonymous]

Here it is

SCHOOL:

LOAD * INLINE [

ID, DATE, Subject,Teacher, Class 1, Class 2, Class 3
1, 1/1/2015,Physics, Tom, Vicky, John, Sam,
2,1/2/2015,Math, Eric, Nickr, Vicky, Kevin,
3,1/3/2015,Science, Catalina, Kevin, Zara, Null,
];

CROSSTABLE (Class, Student,1)

LOAD   [Class 1],

[Class 2],

[Class 3]

RESIDENT SCHOOL;
Tution:
LOAD * INLINE [
Subject, Date
Physics, 1/2/2015
Math, 2/3/2015
Science, 3/1/2015
];