I could see custom tables in my Choice table field.

Is your table in another scope?

Hi @Rohila Voona 

Is your custom tables has choices in the sys_choice.

As I have googled it I think if custom table has choices it will show in the suggestions.

In this case I don't want to add choices to sys_choice I want to get it from custom table.

Okay Got It,

Remove all the configuration for your Product field dictionary.(Remove Choice Table and field,Remove dependent values too)

You should use GlideAjax in your client script and populate options

Below is sample code, Modify accordingly and let us know if You're stuck.

Script Include:

var HelloWorld = Class.create();
HelloWorld.prototype = Object.extendsObject(AbstractAjaxProcessor, {
    helloWorld: function() {
        var res = [];
        var a = this.getParameter('sysparm_user_name');
        var grIncident = new GlideRecord('incident');
        grIncident.addEncodedQuery("active=true");
        grIncident.query();
        while (grIncident.next()) {

            res.push(grIncident.caller_id.title.toString());
        }
        return res.join(",");
    },
    type: 'HelloWorld'
});

Client script:

function onLoad() {
    //Type appropriate comment here, and begin script below
  //  g_form.clearOptions('u_integer_f');
//    g_form.addOption('u_integer_f', "hey", "hey");

    var ga = new GlideAjax('HelloWorld');
    ga.addParam('sysparm_name', 'helloWorld');
    ga.addParam('sysparm_user_name', "Bob");
    ga.getXML(HelloWorldParse);

    function HelloWorldParse(response) {
        var answer = response.responseXML.documentElement.getAttribute("answer");
        //  alert(answer);
        var x = answer.split(",");
        for (var i = 0; i < x.length; i++)
            g_form.addOption('u_integer_f', x[i], x[i]);

    }
}

If my response helped you in any way, mark it as helpful.

@Rohila Voona 

This is working fine,

I want it to onchange value of Product Line.Please give some guidance on that