Save the many sheeted workbook with the new name
Now delete the unwanted sheets - right click each tab and use Delete
If you have lots of tabs: click the first one that is to go; hold SHIFT;
click the last one (do not include the required sheet); the right click and
delete
best wishes
Right click on the Sheet tab required>Move or Copy>click Copy>Select New
Workbook from the dropdown.
You will now be in a new workbook with that sheet included.
Save with whatever name you want