Hi..

I have conditions for progreesive steps in aura.
I have 3 fields 
 <lightning:recordEditForm recordId ="{!v.recordId}" objectApiName = "Case" aura:id="leadCreateForm" onsubmit="{!c.handleSubmit5}" >
        <lightning:messages />
                                
                                <lightning:inputField aura:id="bill" fieldName="Billing_Disposition__c" required ="true"/>
                               
                     
                                     
        <lightning:inputField aura:id="bill" fieldName="Billing_Hours__c" required ="true"/>
                               
                               
        <lightning:inputField aura:id="bill" fieldName="Billing_Comments__c" required ="true" />
                               
                                <br/>
                                <br/>
                                <br/>
                                
        
        
    </lightning:recordEditForm>

my requirement is if any one of these field is null then this page should display else it should be skipped..

and also if any field has value in record page that field should be skipped in record edit form and only fields with no values should be displayd in page for getting values from user..

how to achieve these two conditions..
Can anyone help me with this..