Can I set up my tablet to receive my phones text messages
Yes, you can use Verizon's Integrated Messaging:
Verizon Messages FAQs | Verizon Wireless
Verizon Messages - Verizon Wireless
how do we take one phone number off of the table and replace it with another?
Click on the FAQ link in my earlier post, then scroll down to the section
How do I remove a tablet from my Integrated Messaging account?
Once you've deleted the first pairing, then you should be able to go through the process of adding a new number.