Is csv with multi tabs/sheet possible?

Question

I am calling a web service and the data from the web service is in csv format. If I try to save data in xls/xlsx, then I get multiple sheets in a workbook. So, how can I sa

Answer 1

If I try to save data in xls/xlsx, then I get multiple sheets in a workbook.

Your answer is in your question, don't use text/csv (which most certainly can not do multiple sheets, it can't even do one sheet; there's no such thing as a sheet in text/csv though there is in how some applications like Excel or Calc choose to import it into a format that does have sheets) but save it as xls, xlsx, ods or another format that does have sheets.

Both XLSX and ODS are much more complicated than text/csv, but are each probably the most straightforward of their respective sets of formats.