I am using
import bModal from 'bootstrap-vue/es/components/modal/modal';bootstrap-modal
I have following User Interface in Modal, here I need to choose department from a dropdown(getting item list using AJAX). Here I want to make it easy to add new department by clicking button beside the dropdonw - for such popup modal with UI. 
In vuejs i have code for main modal -
showModal () {
this.clearForm();
this.formInfo.formSubmitted = false;
this.$refs[this.modalInfo.id].show();
}
this is working fine. Now on click event on green button, another modal should be opened over currently opened window. Unfortunately, currently modal is get hidden and new model opened. I have following code for extra modal-
showExtraModal:function(){
this.$refs['extraModal'].show();
}
How can I solve this problem in vue js.