How to add and where to keep to appear in the insert list ?
You probably mean presets. There are many of them in Cubase. Please specify which presets you are referring to and which operating system you are using. Because this determines the storage location of the presets.
I have some vocal presets got made by chatGPT for indian music. But do not know how to add them in Cubase
I think we need to know whether they track presets, effect chain presets, plugin presets, …