Numbers automatically saves your spreadsheet as you work so you don’t have to. You can rename your spreadsheet, create different versions of it, and save it to another location.
Numbers gives a new spreadsheet a placeholder name such as Untitled 1 and saves it to a default location. You can specify a title for the spreadsheet and save it to a different location.
Choose File > Save (the File menu is at the top of your computer screen).
Enter a name in the Save As field.

Enter one or more tags if you like.
Choose where you want to save the spreadsheet.
You can save it to a folder on your Mac or on a server, or save it to iCloud.
Click Save.
When you save a spreadsheet to iCloud, it appears automatically on your iPad, iPhone, or iPod touch (if you set up iCloud) and updates it whenever you make changes to it on any computer or device connected to your iCloud account.
Click the spreadsheet’s name at the top of the Numbers window, then type a new name.
Click anywhere outside the dialog to dismiss it.
To create a version of a spreadsheet, duplicate the original spreadsheet.
Choose File > Duplicate.
The new spreadsheet opens with its name selected at the top of the spreadsheet.
Type a new name.
The duplicate copy is saved to the same location as the original.