After you created a new distribution list from the Contacts section, you can share them with your colleagues.
1. Click on an existing distribution list.
2. Click on the Share button.
3. Find the people you want to share it to, and click on their names.
You can always modify your selection by clicking on the X button next to your colleagues.
4. Confirm your selection by clicking on the Save button.
This new shared will now be available in the Shared Distribution List section of each one of your colleagues.