Picklist Editor

• How can I edit values in a multi-select combo box?
• What is a multi-select combo box?
• How do I add or remove items from a picklist (drop-down field)?
• Why are the styled picklist values not appearing in the preview section using Print templates?
• How do I link a Global Picklist to a Custom module?
• How do I add value to the Lead source in the Global Picklist?