Yes. Form B4a is continuation of B4. In the middle of the B4, you check off if goods to follow, leave blank if goods are accompanied .You can get it reviewed and stamped by the Customs officer while landing..Perhaps the customs officer will give you a 'Casual Goods accounting document', ( I am not sure whether they give this paper to every one as I was only told by one of my relative that he got it when he produced the B4/4A. He had around 18 Boxes on 4 pallets sent by ship arrived after 5 months of his landing ), which need to be submitted while clearing the goods from the customs