How do I link a Global Picklist to a Custom module?

To link a Global Picklist field to a Custom module, please follow the below steps:

1. Create your Global picklist.
2. Create a custom field with the Field Type as Picklist and Picklist Type as Global.
3. Link the custom module in the Global Picklist Settings.

Step 1: Create your Global picklist

1. Click on the Menu and select Settings.
2. Click on Global Picklist under Configuration. 
3. Click on Add Picklist button.
4. Enter the Picklist Name and the field values.
5. Click on Save button.

Step 2: Create a custom field with the Field Type as Picklist and Picklist Type as Global.

1. Go to Menu and select Settings.
2. Click Modules under Module Management tab.
3. Enter the module properties such as Label, App, etc.
4. Configure blocks and fields.
   1. Click Add Custom Field in the desired block.
   2. Choose Field Type as Picklist.
   3. Select Picklist Type as Global.
   4. Choose the custom Global Picklist field.
   5. Click Save.
5. Finish creating a custom module by configuring Default Filters and Relationships.

Step 3: Link the custom module in the Global Picklist Settings.