I make 2 table inside up function. I can access groups table. But how can I retrieve group_details table from create_group function?

public function up()
{
    Schema::create('groups', function (Blueprint $table) {
        $table->increments('id');
        $table->string('email');
        $table->string('group_id');
        $table->timestamps();
    });

    Schema::create('group_details', function (Blueprint $table) {
        $table->increments('id');
        $table->string('group_id');
        $table->string('members');
        $table->string('total_balance');
        $table->string('cost');
        $table->string('deposite');
        $table->string('meal');
        $table->string('meal_helper');
        $table->timestamps();
    });

public function down()
{
    Schema::dropIfExists('groups');
    Schema::dropIfExists('group_details');
}

public function create_group(Request $request){

	$groupname = $request['group_name'];
	$email = $request['email'];

    
	$groups = new Groups();
	$groups->group_id = $groupname . "-".$email;
	$groups->email = $email;


    $group_details = new Groups();
    $group_details->group_id = $groupname . "-".$email;
    $group_details->members = '[]';
    $group_details->total_balance = '7000';
    $group_details->cost = '[]';
    $group_details->deposite = '4000';
    $group_details->meal = '[]';
    $group_details->meal_helper = '[]';


	$message = "Group creation fail!";
	if($groups->save()&& $group_details->save()){
		$message = 'Group Created success!';
	}
	return redirect()->route('profile')->with(['message'=> $message]);
}