As was said, you cannot create a portal that you can physically go through. However, besides what has already been said, if you make a portal for spirits to come through or your astral form to go through, it is opening a gateway that can allow more than what you desire to come through while open. This is usually the case with many very active hauntings. So be aware of this. This is why you should always listen to Ann Lander's golden rules of living! It applies to magick too.
1. If you open it, close it.
2. If you turn it on, turn it off.
3. If you unlock it, lock it up.
4. If you break it, admit it.
5. If you can?t fix it, call someone who can.
6. If you borrow it, return it.
7. If you value it, take care of it.
8. If you make a mess, clean it up.
9. If you move it, put it back.
10. If it belongs to someone else, get permission to use it.
11. If you don?t know how to operate it, leave it alone.
12. If it?s none of your business, don?t ask questions.
I love these...so true.