Changing Demiplane Portal Location

[ArcherBlack]

Maybe I am a bit retarded and haven't looked hard enough, but after making a Greater Demiplane permanent, is there anyway to change where the portal on the material plane is located? For example, if you put it in your fort, but that fort is going to fall, and you don't want invaders also invading your demiplane, can you move the portal's location so as to prevent the demiplane from getting compromised?

[blahpers]

Please don't use that word, even for self-deprecation.

There is indeed a way!

Create Demiplane wrote:

Alternatively, when cast within your demiplane, you may add to your demiplane (or remove from it) one of the following features (or any of the features described in create demiplane) with each casting of the spell, in which case it has an instantaneous duration.

Create Demiplane wrote:

Portal: Your demiplane gains a permanent gate to one location on another plane, which can only be used for planar travel. This location must be very familiar to you. This gate is always open and usable from both sides, but you can secure it using normal means (such as by building a door around it).

So, you can cast create greater demiplane again to remove the portal entirely, than cast it once more to add a new portal. Note that these castings do not need to be made permanent--they instantaneously modify your existing permanent demiplane--so as long as you have your focus, you're in good shape.