<form name="completeForm">
<subform1></subform1>
<subform2></subform2>
...
<subform10></subform10>
<div>
<button ng-click="continue(fnolForm, $event)></button>
</div>
</form>

private continueBtn : any;
private continueFunction : any;

this.continueBtn = document.querySelector('.continue');
this.continueBtn.addEventListener('click', this.continueFunction);
this.continueFunction = (e: Event) => {
...//custom validations first
if(custom validations)
{
this.$scope.completeForm.$valid = true;
this.continueBtn.click();// move to parent form continue click function
}
}