15CB where property sold in past years.

sir,
if the assessee sold a property in py 2018 19 & amount deposited in nro bank account. now in current year if the assessee wants to remit the money to abroad then in form 15CB transaction details of 18 19 that is long term capital gain ,TDS deduction details required to be mention ? or nature of remittance is to be mentioned as other ( not in the nature of income) since the transaction relates to py 18 19 & ITR for that year has already been filed ?.

2. Also in case the assessee wants to remit interest received on nro deposits to Nre account. Then tds deduction entry comes in every quarter on bank statement & 15CB accepts only one date of tds deduction then in such case multiple 15CBs required to be filed ?