Hey Buri welcome to the forums
Great to see your progress and that you are delving into the TQ editor - keep at it! For traversing from overground to underground you need to place and link two portal entrances. The first you've already done with that latest screenshot of the tomb entrance. Now you only have to create the dungeon itself and add the opposite portal. To do this:
a) In the Editor switch to Layout Mode and click Region > Add New Grid > then click on Source > Maps and add a name for easy reference.
b) Click on your new dungeon grid and enter Editor Mode, then click on the Grid Icon which is on the top tool bar next to the Door Icon.
c) Now under 'System' you can select a dungeon tileset from the list, for example try
greece\athenscatacomb01d) Add your floors and walls to the grid followed by an entrance feature in the Feature List
e) Once this is done click on the Door Icon, you'll see the entrance portal highlight (usually yellow). Click the ellipsis then click on the highlighted yellow space - you should see a number code appear. Now switch to your Terrain map where the other 'above ground' portal entrance is and do the same process using the second ellipsis. So you should end up with two number codes. Now hit Link.
That's basically how to link portal entrances... but there are some things to note. Firstly, if you get an 'Invalid Link Error' message, just save your current work, exit and reopen the Editor. When you try to link things up now it should work fine.
Secondly, some portal entrances don't match correctly with others. It usually depends on which tilesets you're trying to link. Generally its best to use the matching sets, such as Greek tomb entrance to Greek grid tileset, but even then sometimes it just won't link. So you have to play around to find one that links correctly.
Hope this helps
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good stuff Sauruz, I'll have a good read later on when I'm not at work
