How can I preview the invoice before printing and set print settings like the number of copies?

To preview the invoice before printing follow these steps:
 Step 1: Go to transactions menu
 Step 2: Then Open the invoice such as sale,purchase etc 
 Step 3: Afterwards create the invoice Then press shortcut key ALT+P or click on print button 
 Step 4: Then click on sales invoice or purchase invoice etc and press the key ALT+P again or click on preview button 
 To set number of copies setting follow these steps:
 Step 1: Go to administration menu 
 Step 2: Then click on configuration option 
 Step 3: Then click on voucher series series configuration 
 Step 4: Then select the invoice such as sale ,purchase etc 
 Step 5: Afterwards press enter then select the series 
 Step 6: Then click on voucher configuration button 
 Step 7: Then select print sales invoice after saving option as y to enable it 
 Step 8: Then click on specify default number of copies and set it as y then specify number of copies and save it 
 Step 9: After that save the configuration 
 Step 10: Then go to transactions menu and open the voucher and check by print the invoice