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php database addition problem

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good day everyone, Am trying to update my poduct table such that each time
item quantity is added to item total the value keeps up increasing
eg 1+1 =2, 2+3 =5 and so on, but if I try to update the table column(item_total),
the new update always replace the old value instead of increasing it and the error below will
be displayed

"Notice: Undefined index: Radio in C:\test\htdocs\product.php on line 32"

below is my effort so fare, any help please

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You mean you want to $_POST['item_quantity'] to be added to item_total in the database? Then change the sql statement to
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