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Doesn’t mass product attribute updating fit your needs ?
Select the products by clicking on “Select All” or “Select Visible” after you have applied the filters, or just select them manually, then select “Update Attributes” in the “Actions” drop-down and click on “Submit”.
On the “Update Attributes” page check the “Change” checkbox at the field you want to change, put the value in this field, and submit the form.
Please let me know if it is not the thing you are talking about.