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There are 2 different approaches. The first is possible in the standard editor: you simply need to place trees (usually jungles) diagonally, leaving a passage between them (it will be visible in passage mode). To make it more difficult to find, you can place obstacles, such as logs, in the path. Or, the passage can be visible, but you can confuse the player by overlaying transparent ponds on top (it will seem as if you need to swim). The second approach is implemented using the advanced editor (WOG/SOD): place the desired object in the desired location, then right-click on it and select "Additional Properties" from the menu, then in the "Image" field, click the first button "Select image from LOD," find the desired object in the list, and click "OK." Or, first find the desired object, copy its name (e.g., AVXboat2.def), and paste it into the "Image" field, then click "OK."