How do I make multiple room structures?

In these times, I have tried to create a crypt, that contained more than one structure, what I've built. I've begun a kind of coding, what used the procedure, that when one part has been genera... nevermind, I wouldn't be able to explain it. So, e.g. I've made a mine tunnel, what could generate from the "mine entrance", what can generate from "secondary corridor", what should generate from "main corridor" and that can generate from the "crypt entry" part. I've made that when a kind of structure is generated, I've made a structure spawn element for them, and coded, that "On Structure Instance Generated", that what types of structures can be generated from it. 'till the "main corridor", that was fine. When I've checked it in a generated world, it worked perfectly(except that I've written the rotation and the coordinates wrong), but the others didn't spawn. And I know that this is not a bug. Even during the coding, I was sure that it will not work. I was just wanted to try it. I just wanna get an answer for this, that is there any way to make this?

I know that I probably won't get an answer to this, but still. Thank you if you'll answer and Merry Christmas!