You can use this add-on to manage the pages in a Google Sheets file.

You can 

 > hide or show pages, 
 > protect or un-protect pages, 
 > delete pages, 
 > duplicate pages, 
 > rename pages, 
 > reorder page sequence, 
 > clear data and/or formatting, 
 > remove unwanted rows, 
 > remove unwanted columns