How to load method CustomRepositoryEloquent of other CustomRepositoryEloquent?

Hi,
I have one doubth, how to load one method (...RepositoryEloquent) of other CustomerRepositoryEloquent

Example:

```
find(config('company.tax'));
$get_irpf = $tax->value*($amount/100);
return $get_irpf;
}

public function boot()
{
$this->pushCriteria(app(RequestCriteria::class));
}
}

```

Now, how to load the method getTaxOfAmount in my other CustomRepositoryEloquent ?

```
pushCriteria(app(RequestCriteria::class));
}
}

```

Thanks.