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Products > Manage products > Manage via CSV > Edit options
"Color{Black|White}//Size{S|M}//Pattern{Sun|Star}”, changing the number of options and writing... If the existing options are "Color{Black|White}//Size{S|M}//Pattern{Sun|Star}”, maintaining the number of options and writing... “Color{Black|WHT}//Size{Free|M}//Pattern{Sun|Star}” will change the variant from “White/S/Sun” to “WHT/Free/Sun”.
For products with inventory tracking enabled, editing