Following is my code and how to divide into two columns:
<form onSubmit={handleSubmit(this.onSubmit)}>
<div className="row">
<div className="col-12 col-md-8">
<div className="col-12 col-md-3">
<label>Promotional Code</label>
</div>
<div className="col-12 col-md-3">
<label>Promotional Code</label>
</div>
</div>
</div>
</form>