Myke said:Unfortunately because of the nature of the sheet, Columns from F-IV are all formulas in a calculation matrix (approximately 2.6Million formulas in total ) if I were to add another Sheet to the book then it would mean a LOT of recalculation to "point" to the new sheet. Thanks for your help though. I'll just have to tell our MD ray: (again) that if he needs the workbook to do more than it does, he'll have to pay for a proper database !!!