Yes, it is possible to daisy chain a Google Voice number to another Google Voice number. Here are the steps you need to take:
Create a forwarding number in Google Voice. To do this, go to the Settings page in Google Voice and click on "Add a forwarding phone".
Enter the target Google Voice number that you want to daisy chain with your Google Voice number.
Set a forwarding rule from your Google Voice number to the target Google Voice number. To do this, go to the Settings page and click on “Add a forwarding phone” again.
Add the target Google Voice number as your forwarding number and tick the checkbox next to the “Make this the only active Google Voice number” option. This will ensure that all calls to your Google Voice number will be forwarded to the target Google Voice number.
Set up Call Forwarding for your target Google Voice number. To do this, go to the Settings page and click on “Call Forwarding”. Select “Forward incoming calls to” and enter the Google Voice number you created in Step 1 as the forwarding number.
Once you have completed the steps above, all calls to your Google Voice number will be forwarded to your target Google Voice number and all calls to your target Google Voice number will be forwarded to the Google Voice number you created in Step 1.
If you need more information on how to use Google Voice or its features, you can find detailed instructions here:
https://support.google.com/voice