I've been following the following pattern to create multiple sheets and multiple workbooks using Excel InterOp. Now, I would need to create a let's call a master workbook which would contain some of the sheets out of the sheets that I've been creating in the original workbooks. Just to give an example, let say WorkBook1 had Sheet1 and Sheet2, and Workbook2 had sheet3 and sheet4. I want the Master workbook to have Sheet1 and Sheet3. I'm looking for a way to create the sheets (sheet1, sheet2, sheet3, sheet4) that I've been creating for WorkBook1 and WorkBook2, but also with minimal amount of code repetition add sheet1 and sheet3 to the Master workbook. Any help will be appreciated.I've been following the following pattern to cr