JSFiddle - React, Tailwind, and code Playground

HTML

<div class="em_pho cloned-row" id="em_pho">
    <div id ="phone_div" name="phone_div">
        <select id="sel_phntype" name="sel_phntype" class="sslt_Field">
            <option selected='selected' value=""></option>
            <option value="BUSN">Business</option>
            <option value="CAMP">Campus</option>
            <option value="CELL" selected>Cellphone</option>
            <option value="CEL2">Cellphone2</option>
            <option value="FAX">FAX</option>
            <option value="HOME">Home</option>
            <option value="OTR">Other</option>
        </select>
        <span class = "ph-inline">
            <input type="text" class="cc_field txt_CC" placeholder="Country Code" id="txt_CC" maxlength="3" name="txt_CC" /> 
            <input type="text" class="pn_field txt_Pno" placeholder="Phone Number" id="txt_Pno" name="txt_Pno" />
            <input type="radio" class="preferred" checked name="preferred" id="rad_Prf" value="preferred"/>
                <label class="radio-label">Preferred</label>
                <!--<button class="btn_more" id="buttonvalue"></button>-->
                <input type="button" value="add" class="btn_more phn_more" id="buttonvalue"/>
                </span>
            </div>
    </div>

JavaScript

$(document).ready(function(){
	var count=0;
    $(document).on("click", ".btn_more", function () { 
        var $clone = $('.cloned-row:eq(0)').clone();
        $clone.find('[id]').each(function(){
            this.id=this.id +(count)
        });
        $clone.find('.btn_more').after("<input type='button' class='btn_less1 phn_del' value='Del' id='buttonless"+count+"'/>")
        $clone.attr('id', "added"+(count));
        $clone.find('.preferred').attr('checked', false);
        $clone.find('.sslt_Field').val(0);
        $clone.find('.txt_CC').val('');
        $clone.find('.txt_Pno').val('');
        $(this).parents('.em_pho').after($clone);
        count++;
    });

    $(document).on('click', ".btn_less1", function (){
        var len = $('.cloned-row').length;
        if(len>1){
            $(this).closest(".btn_less1").parents('.em_pho').remove();
        }
    });
    $(document).on('change','select.sslt_Field',function(event) {
        var _found = false;
        var cI = $(this);
        var others=$('select.sslt_Field').not(cI);
        $.each(others,function(){
           if($(cI).val()==$(this).val() && $(cI).val()!="")
           {
               $(cI).val('');
               alert('already selected');
           }
        });
    });
});