add new system attribute in magento

I want to add a new attribute named ‘category’ as system attribute which will be available in all attribute set.Can anybody help me…please give me solution how to do this…thanks

2 thoughts on “add new system attribute in magento”

  1. As far as i know the only way to add a system attribute is to do it through database call. You will need to write extension that includes setup installation script for SQL (see any core extension for examples) and use addAttribute method.

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