I want to add an extra attribute value to all products.
so we are planning to update through import products using .csv
please give me the procedure to add only one attribute values.
thanks in advance
First create the attribute in the admin area by navigating to Catalog->Attributes->Manage Attributes. Then in your csv file add the attribute ID to the header of the column containing the value. Also ensure that you have a SKU column and then import the CSV using dataflow profiles but ensure that you match the 2 columns to the corresponding attributes. An example of the CSV could be:
"SKU001","New Attribute Value"
"SKU002","New Attribute Value"
"SKU003","New Attribute Value"