How to move single Excel sheets into another document
1. Open document
Open the document.
2. Mark existing sheets
Select the sheets you want to keep (shift+click to select multiple).
3. Right-click
Right-click on one of the selected sheets.
4. "Move or copy"
Select "Move or copy".
5. Copy to new workbook
Check "Create copy" and select "New workbook" in the upper selection box. Excel will then copy all currently selected worksheets into a new document.
6. Save
Then save the new document. When all the desired worksheets have been moved to the new document, you can delete the old document.