Hi,
Please go to Admin -> Theme Options -> General Options -> Analytic code -> Insert the given below code and update options.
<script type="text/javascript">
jQuery( document ).bind( 'woocommerce_update_variation_values', function() {
jQuery( '.variations select option' ).each( function( index, el ) {
var sold_out = '<?php _e( 'sold out', 'woocommerce' ); ?>';
var re = new RegExp( ' - ' + sold_out + '$' );
el = jQuery( el );
if ( el.is( ':disabled' ) ) {
if ( ! el.html().match( re ) ) el.html( el.html() + ' - ' + sold_out );
} else {
if ( el.html().match( re ) ) el.html( el.html().replace( re,'' ) );
}
} );
} );
</script>
Thanks
Mohammad