You can bind a drop-down list to a process data that contains a comma-separated list. In the .NET code-behind:
protected void Page_Load(object sender, EventArgs e)
{
base.Page_Load(sender, e);
REQUEST_MYLISTITEMS.Text="item1,item2,item3";
REQUEST_MYLIST.DataSource= REQUEST_MYLISTITEMS.Text.Split(',');
REQUEST_MYLIST.DataBind();
}
where REQUEST_MYLISTITEMS
is the field that contains the process data value and REQUEST_MYLIST
is the drop-down list that you want to populate