The expanding of your consciousness allows you to see the dimension that is anchored and on the other side of the gate easier. It consists of moving all of your chakra's energy into your third eye. Moving all of the chakra's energy creates a gateway, created by thought and use is nothing as you think and seem to the higher self of light energy and you are where you are.
In definition, a trans-dimensional portal is a gateway between universes. These portals break in the intent to stop and your doing is what energy your subconscious uses as if you open the fabric of reality and create a direct link into time-space, as a link which is felt and thought suppressed in mind as the body is use for the inversion of space-time is travelling. By traversing through time space, one is able to basically travel into any time or place imaginable. As if a tunnel that you walk with as through the area you are where you are, as if you think and know from the reality that is inflormation in a streamed energy from the galaxy.
It is basically beyond the power of a mortal to create them. It takes extreme skill. There are about 5000 countless ways to do so. None will work, unless you are extremely strong in energy usage. A demi-god can basically create a portal with just his mind, and no outside stimuli. However, even humans can create a lesser form of them. That is what happens with the Ouija boards, as the portals made by ouija boards are lesser portals.
There isn't really a safe way to make a portal, but using a ouija board is one way. And from experience it is pretty hard to use a ouija board safely. Ouija boards create a portal into the spirit world or hell itself.
Chanting the names of angels is another way. But, it would be extremely hard for someone to create a portal that they can actually travel through.
You can make a portal effect by thinking of the place you want to be in, then placing two iron rods or coat hangers or wood pieces, one in front and to each side of you and walking through them after imagining energy arch between the two placed things. Imagine going through a tunnel to the place you want to goto as you do. Or, walk between a frame or door thinking of the place to get to. Its sometimes very hard in truth to those without the personal power, or poder, to make it work.
If you succeed, then all you need to do is close your eyes and your there, anyway at least you can feel the place your spirit went to, as its sometimes your spirit that splits off to make travel. But to some, that method is basically the same as saying, "You can make a portal by thinking you are in another place while taking a shit."
By touching something after thinking you are in another place you can shift there. The touching an object one has a benefit. As you can use an object to shift back, and it won't happen on the spur of the moment. When you use an object to shift, you end up using something to shift back. However, if one doesn't have an object to focus on while returning, they can get stuck in time-space, and perish.
If one has enough energy to make a portal, they don't need a doorframe. They just can rip a hole in the fabric of reality anywhere, or imagine themselves there where they want to be and they are there. Its easier to travel to parallel worlds. As they are similar in nature.
Pseudo-portals can be made to transport energy and info from one place to another. The idea of it is good for sterile communication between people and as an energy output/input. All energy that enters the portal is possible to be put through the firewall effect. The whole thing is torn apart then rebuilt on the other side. It's a form of gateway in that the energy in one end is used to power the other through a 'mirror' link, where that the two sides are connected regardless of distance.
There are some naturally occurring trans-dimensional portals on Earth. The Bermuda triangle is probably the most well known of these portals. Stonehenge and the pyramids of Egypt are also trans-dimensional portals, however one can make the assumption that they are accidental portals, or portals that were unintentionally made. Natural trans-dimensional portals occur in areas of the earth where the energy is very strong or where the energy has been magnified.
More idea on trans-dimensional shifting is here @ http://spellhawk.blogspot.com/2009/06/how-to-dimensionally-travel.html