Because it seems so hard for other to install several mods, I'll give example of my setup of ComplexBreeding + CheatMenu
Here is the CheatMenu mod by 'zvnlot' called MBMModMenu:
Here is the ComplexBreeding Mod by 'guyverek'
https://f95zone.to/threads/monster-black-market-v2-0-15-1-dlc-team-apple-pie.124772/post-10016740
For the basic game version : MBM v2.0.15.1 + DLC + Uncen v2.0.14.0
For the BepinEx : BepInEx x64 v5.4.21.0
(I used windows 64)
For the ComplexBreed Mod: v0.5.0.15 (.16 I assume also compatible)
also BepInEx Configuration Manager v18.0
for Cheat Menu Mod: MBMModMenu
Inside BepInEx/plugins should shows 3 files:
ComplexBreeding.dll , ConfigurationManager.dll , MBMModMenu.dll
It's quite simple actually, but the problem usually comes with compatibility so u should always understand the requirement of each mods.
for ex: ComplexBreedingMod made for BepInEx v5.x
A lot of cheat menu made for the latest BepInEx v6.x
this usually wont work, some compatible for v5.x
This is why if u want other understand what is your problem, u need to help them understand which version of each part are u using.
Hope this helps, have a good day