Because customers often ask if it's possible to create custom field dropdown lists, here is a short HowTo:
1. Login to SLM with an administrator account.
2. Go to "Home\Administration\Custom fields"
3. Add a new custom field
4. Edit the Name, Category and choose the Type "Text".
5. Choose "Multi select" in your custom field, type the value you need and then click "+" to add this value to the dropdown list.
After adding all the values click "Save".
6. After you have saved the custom field, you could add this filed in the defined object and choose out of the defined values.