Please tell me how to write this multi-level linkage code?

Question

I am a novice and couldn't find the code for this kind of multi-level linkage on the Internet, so I had to come to the program for help. The program is zblog and the imperial cms page needs to have this kind of multi-level linkage from Taobao. Multi-level linkage needs to have 1, 2, and 3 in the picture below. How to write a request for advice? Thank you very much

autoload · Answer

//m.sbmmt.com/course/882.html

//m.sbmmt.com/code/4718.html

Realized case of linkage