Convert a mutli colum Multi roy table to a 3 column table

I have a multi column 100*50 table like this

SPACE item1 item2 item3
space 1 10 100 200
space 2 11 101 201
space 3 12 102 202
space 4 13 103 203
space 5 14 104 204
space 6 15 105 205

Ana want to convert it like
space 1 item1 10
space 1 item2 100
space 1 item3 200
space 2 item1 11
space 2 item3 201
...

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