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where do you add code to modify magento admin

where do you add code to modify magento admin

I found many solutions on stack exchange on how to modify my admin product list  ( i want to sort by multiple columns )

 

All solutions, require you to add php functions as seen in the link below.

 

http://stackoverflow.com/questions/40459026/default-multiple-sort-columns-in-magento-custom-admin-gr...

 

Where exactly would l  implement this code?