Creating sectors within sectors in Deth4.24

[Guest Fanatic64]

I want to know how to create a sector within a sector in Deth. For example, I've created a square sector which is a room. Then, I wanted to add another sector which is a small square at one of the corners of the existing sector. What is the correct way to create and define the lines so that I get two different sectors? I already read the tutorials and tried experimenting with the editor but I still can't figure it out. Is it just me or is Deth a difficult editor to use? Thanks in advance.

[Gokuma]

Add the apropiate sidedefs to the sectors and check their sector references. Look at which way the linedef goes by the arrow on its end. The right side of the linedef is the 1st sidedef and the left is the 2nd. Make sure sidedef has the number of the sector it's against for its reference.