Effective date set for commencement of amendment treating certain goods as deemed manufacture under Central Excise law. Appoints the effective date for commencement of the amendment to deem certain goods as manufacture for Central Excise, invoking clause (b) of section 66 of the Finance Act, 2006, and designating the date on which that provision becomes operative; the amendment concerns parts of automobiles, a plant growth regulator and toothbrushes.