Well, the Fet itself is apparently a BUZ11, but even that is just a text string.
You can at least remove the aliases for IRF3205, IRLB88721PBF, IRLZ34N and IRLZ44N.
You can also edit the original BUZ11 to represent the data from the IRF740, and then remove all aliases. but why bother?
Because I am not willing to agree to youtube’s terms I am currently unable to view youtube video’s unless they are directly embedded in another website.
Don’t blame me, go blame youtube for their policy.
You are also working on a copy of the original symbols, in your own lib, so if you make any errors it’s easy to throw the whole component away and do it again.
Don’t be afraid to make mistakes. Learning from mistakes is often more educational and productive than being extra careful to not make any mistakes at all.
There are also some pretty well maintained FAQ articles about libraries on this website. An index to the FAQ articles is in: