Unpivot several columns with attribute and value

i take these example

ok problem solve follow below step

1. select  ID Articolo and unpivote other column

2.  replace value  code mat1,  code mat2,  code mat3,  code amt4 to code

    and qt mat1,  qt amt2,  qt amt3,  qt mat4  to qt

3.  add conditional column like these

which look like these  

4. add another conditional column like these

5. copy  qt  column and paste to new table(qt table) and add index column which look like below

6.  now return to original table and add index to original table 

7. now merge original table and qt tqble 

8.  now expand table  click on rounded(red) area 

by clicking red area open interface and from that unselect index column

press ok which look like these

9.  change qt table name to qt and select Id Articolo, code and qt and remove other column and it look like these

10. now filter table and which show those value non-null value 

and it look like these

here solution done 

don't get  confuse with values because i take some different value from you but following my step you got your answer here t attach step screenshort for comfortness 

close and apply from home tab and paly with it

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