Predefined Values
Predefined values can be codes or other content that you want shoppers to choose from during checkout, for example order reference codes, purchase order numbers or product options.
Add/edit a list of predefined values 
1 On the menu bar, choose Advanced > Predefined Values.
2 Click the Add button to add a new list of values.
3 Enter a Name for the new list of values and choose Customer Reference from the Application drop-down list.
Now you can upload a TXT or CSV file which contains the values – one code per line in the file you upload.
Alternatively, choose Free Text Option from the Application drop-down list to create predefined values for Product Options.
4 Browse to the file with values and upload it.
The values you have in the file now appear in the Content panel.
5 Save your changes.
Now this list can be enabled when setting up your Store in the General Tab.
doc. version 6.0.4