Adding Custom Fields (Columns) to the Database
You can create your own additional fields (Example: "Invoice") in the database using the "Config > Setup > Custom Fields" ribbon bar option. The software will permit you to display custom fields (the ones created by you).
Editing Custom Fields (Columns) in the Database
You can edit the additional fields in the database using the "Config > Setup > Custom Data" ribbon bar option. You can select the fields that should be modified so that the rest of the custom columns are not modified. The data corresponding to a group of domains also can be edited by highlighting the domains and then clicking the "Custom Data" button.