Adding multiple vendors on RFQ form through a multiselect form

The form opens as below:

Below is the logic for the ok click :

void clicked()
{
    MultiSelectionHelper    selectionHelper = MultiSelectionHelper::construct();//Create instance of class
    Set                     selectedRecords = new Set(Types::Record);//Declare a set of type record
    VendTable               vendTableLocal; //Your table buffer
    Args                    args = new Args();
 
    super();

    selectionHelper.parmDataSource(VendTable_DS); //Set the datasource
    vendTableLocal  = selectionHelper.getFirst(); //assign to table buffer the reference to selected record(s)

    if (vendTableLocal.RecId)
    {
        while (vendTableLocal)
        {
            selectedRecords.add(vendTableLocal);
            //info(strFmt('Selected record.. %1',vendTableLocal.AccountNum));//Display selected record
            con = conIns(con,1, vendTableLocal.AccountNum);
         
            vendTableLocal = selectionHelper.getNext();
        }
    }
}

this lookup form will open from RFQ Form in Vendors Tab:

Below is the logic when this menue button is clicked on the Vendor tab and the code opens the lookup form from where we can select multiple vendors and then those vendors are added to the form grid:

void clicked()

{

    container   con;

    int         i;

    FormRun formRun;

    Args args = new Args();

    Object  objRun;

    VendTable   tempVendTable;// = VendTable::find(purchRFQVendLink.VendAccount);

    //super();

    //new MenuFunction(menuItemDisplayStr(AXPRFQVendorLookup), MenuItemType::Display).run();

    args.name(formstr(AXPRFQVendorLookup));

    //args.record(CustTable::find('ABC'));

    formRun = ClassFactory.formRunClass(args);

    formRun.init();

    formRun.run();

    formRun.wait(true);

    objRun = formRun;

    con = objRun.getVendAccount();

    // string to container

    // for sorting

    for(i = 1;i<= conLen(con) ;i++)

    {

        info(conPeek(con,i));

        tempVendTable  = VendTable::find(conPeek(con,i));

        purchRFQVendLink.VendAccount = tempVendTable.AccountNum;

        purchRFQVendLink.initFromVendTable(tempVendTable);

        purchRFQVendLink.insert();

        vendTable.data(tempVendTable);

        vendTable_DS.setCurrent();

        vendTable_DS.rereadReferenceDataSources();

    }

    purchRFQVendLink_ds.executeQuery();

}