Aruba Networks PowerConnect W Clearpass 100 Software Deployment Manual page 164

Because an array value may not be stored directly in a custom field, you should use the conversion and
value formatting facilities to convert the array value to and from a string when using this user interface
type.
To store a comma-separated list of the selected values, enable the Advanced options, select
"NwaImplodeComma" for Conversion, select "NwaExplodeComma" for Display Function and enter
the field's name for Display Param.
The "Vertical" and "Horizontal" layout styles control whether the check boxes are organized in top-to-
bottom or left-to-right order. The default is "Vertical" if not specified. When using these options, you may
also specify the desired number of columns or rows to adjust the layout appropriately.
164 | Guest Management Amigopod 3.7 | Deployment Guide