Deleting a custom field from the workflow table in the database is a two-step process:
Remove the custom field from all forms using the Fields on Form tab. It will no longer display on the form.
Delete the custom field from the workflow table. This step is described in the procedure below.
To delete a custom field from the workflow table:
On the Navigation menu, click Administration ยป User-Defined Data.
In the User-Defined data form Area field, select All Workflows.
On the Custom Fields tab grid, select the field that you want to delete.
Click Delete.
Click Save.
Delete a custom field from the projects form