To create Custom Field in MailBluster, go to Fields section and then click on Add new.
![Going to fields section and then click on Add new](https://mailbluster.com/wp-content/uploads/2024/01/custom-field-01.png)
Enter Field label and then Field merge tag will be auto generated.
![Entering Field label](https://mailbluster.com/wp-content/uploads/2024/01/custom-field-02.png)
Here we used the Field label “State” and Field merge tag “state” is auto generated instantly.
![Using Field label and then Field merge tag is auto generated](https://mailbluster.com/wp-content/uploads/2024/01/custom-field-03.png)
Now we can use this custom field “State” in Leads, Standard Segment, Forms and Campaigns quite easily. Here are some examples:
In Add Lead:
![Custom Field "State" can be used in Add lead](https://mailbluster.com/wp-content/uploads/2024/01/custom-field-04-1.png)
In Standard Segment:
![Custom Field "State" can be used in Standard Segment](https://mailbluster.com/wp-content/uploads/2024/01/custom-field-05.png)
In Forms:
![Custom Field "State" can be used in Forms](https://mailbluster.com/wp-content/uploads/2024/01/custom-field-06.png)
In Subject of Campaigns:
![Custom Field "State" can be used in Campaigns](https://mailbluster.com/wp-content/uploads/2024/01/custom-field-07.png)
In Edit Content>Compose mail under Campaigns:
![Custom Field "State" can be used in as Merge Tags](https://mailbluster.com/wp-content/uploads/2024/01/custom-field-08.png)