Incorporating the Nominal Account Code in Downloaded CSV files

I had envisaged downloading multiple nominal account details files by selecting the appropriate entries in the Chart of Accounts Report via tick-boxes at the left hand end however I realise that leaves the facility open to downloading ALL the details for all nominals with the appropriate drain on IT resources.
Next I thought that my requirement could be addressed by incorporating the nominal code in each record of the csv file. I can manage the downloads and then manage the merge of data for the sort of off-line analysis that I am contemplating. I would suggest from my somewhat ancient knowledge relational DBMS’s that the nominal code is stored in the record anyway?
Just a thought as more for the BI side of business.
Regards NDG1944