Apparently, putting lots you've created into the Specialty bin so you can find them is just a matter of the file placement and name. They need to be in one of the LotTemplates folders and have the _Permanent attached to the name.

I did it by placing them all from my bin into an empty test hood, so that I could find them from outside the game easily. I, then, closed the game, went to the test hood LotCatalog, added the _Permanent to the file names and moved them to the LotTemplates folder. It doesn't seem to matter which one you put them in. I tried a few different ones and they all worked.