You can easily merge multiple existing lists without deleting any of your contacts.
Here is what you need to do:
1. From your Constant Contact account, click on Contacts. 2. On your left-hand side Click on the name of the list you want to copy 3. Select all of your contacts by checking the small box on the left of the “Name” column 4. Click on “Add to Email Lists” in your top menu 5. Make sure you leave the existing list checked and then, select the additional list where you want the contacts to appear.
Note: You can also click "Create a new email list" to make a new list option.
6. Last but not least, click on Apply
That’s all! Now your contacts have been merged into the email lists you selected.
There are other similar tasks you can complete from the Add to Email Lists button. Here are some: