I usually use project parameters to control globally, for example, the dimensions of the windows profiles and their sills across different families and types in the project, so that if they ever change I only need to change the value in one place instead of in all the endless variants of the windows.
The thing is, every time I duplicate a family type, the new type losses the project parameters links.
It would be tremendously useful if those were to be kept (or a question to keep or lose them would appear, and we could choose).
Please implement this ASAP!