Nro to Nre transfer form 15CA and 15CB

Hi. I came from lndia to lreland in March 2021. My husband, a German pensioner resided since several years in lreland. He passed away in March 2023. During the course of marriage he transferred money to lndia as family maintenance and after his death l transferred 50% of his pension savings to my lcici bank resident account. Recently l opened my NRO and NRE account with lcici bank in lndia. Bith accounts are in sane branch at Secunderabad. The resident account got converted to NRO account and now l am wishing to transfer the money to NRE account because it is originally from lreland and not subject to tax in lndia. I would pay 30% tax on money that should not be taxed at all. I need help with login to my account on IT portal and fill up form 15CA and 15CB for each individual transfer l make from NRO to NRE. If l transfer as maintenance and savings, do l still have to submit FORM 15CA part D and form 15CB? I have all bank related documents that show these transfers from lreland to lndia. I need help with all of this as l am very confused.