You can add fields to the load file from the production fields on your site, or you can create custom fields.
Adding Fields to the Load File
To add a field to a load file, move a field from the Available Fields list to the Selected Fields list by clicking on the arrows to the right of the Field Name. If you want to move all of the fields in your database to the load file, simply click the Move Right button between the to Available Fields and Selected Fields lists.
Creating Custom Fields
To add a custom field, click the +Create Custom Field button, and the Create Custom Field window will appear.
Then you will be required to give your Custom Field a name.
Next, you can either enter text directly to appear in the field content, or if you need to create a rule, click the Advanced Options link under Field Content, and select the +Add Rule button. The Search Assist window will appear, and you will be able to build a search to find documents, and then you will be able to have either fielded text appear, or you can specify custom text by selecting the applicable radio button beside Text or Field.
Note: Creating a custom field does not add the field to the document records, it just adds the information to the load file. You can use this if you want to provide a specific bit of information to each record in the load file.