How do I merge a distribution list into another?
How to merge one Distribution List into another by exporting and re-importing contacts.
Written By Danny Schaffer
Merging lists together can be done by exporting the first list and uploading it into the second list. The steps for this are as follows:
Exporting a Distribution List
Head to the Contacts page.
Click on the title of the Distribution List that you want to merge into another.
Scroll to the Edit Distribution List area on the bottom right.
Click Options >> Export All XXXX Contacts.
The file will automatically download, and then you can find it in the Downloads folder of your computer/browser.

Uploading the exported file to the new Distribution List
You can view this article (Importing and Uploading Contacts into rezora) for specific details on importing a list of contacts or read through the bullet points below.
Head to Contacts > Import Contacts > Import from CSV File
Click Begin Importing
Click Upload File and select the file you downloaded.
Map your contacts
Click Continue to accept mapping.
Click Submit to be taken to the final page of the import process.
On STEP 3 of the contact import process, select the "Keep CSV contacts" option
On STEP 4, click Add to Lists or Spheres to select the distribution list that you are merging INTO
Click Execute Import