TExcelFile.AddSheet Method
Inserts an empty sheet at the end of the file. This is equivalent to calling InsertAndCopySheets(0, SheetCount + 1, 1). If you need to insert more than one sheet, or insert it at the middle of existing sheets, use InsertAndCopySheets(Integer, Integer, Integer) instead.
Syntax
Unit: FlexCel.Core
procedure TExcelFile.AddSheet;