Title says all. Sorry in advance I started doing this today. I ripped a Nintendo DS ROM using VGMTrans. I extracted the banks of each song in the OST and downloaded them as .sf2 files (pic 1).

I am aware that the instruments are "reused" because they are samples and are not individual samples. How can I merge any of the duplicate samples in order to make them neat and organized like pic 2
instead of pic 3?

(EDIT): Adding the fact that I am using FL Studio 21 on Windows 10. This may be relevant but it also may not.
Thank you very much for any assistance!!