[Vuejs]-Vue How to Trigger Child Component on Submitting Form

You can set control clicked data like toggleShow with boolean type and use v-if for your component trigger

<template>


    <div>

        <PhoneNumberLineComponent v-if="toggleShow"></PhoneNumberLineComponent>

        <button @click="toggleShow = !toggleShow">Button</button>
    </div>


</template>

<script>
    import PhoneNumberLineComponent from './PhoneNumberLineComponent';
    export default {
        name:'ButtonComponent',
        components: {
            PhoneNumberLineComponent
        },
        data() {
            return {
                lines: [],
                blockRemoval: true,
                index:[],
                toggleShow: false
            }
        },

    };
</script>