How to fetch data from Single select to Multi-select drop down
You can use input provided by the user in one or more fields in the form to determine the values in a select box. This technique is useful when you want to provide the user with two sets of multiple valid choices from your data source but do not want to enable the user to specify a custom selection.
ca_fdFetchSelectData('<form _id>','<field _id>');
Release: CASVCT99000-12.9-Service Catalog