Yes, you can write (play and record) a melody using an external keyboard, but you say "midi cable from piano to keyboard"?? Is that right? Cause I don't know any simple way of connecting a midi CABLE to a modern PC without more cables. Or are you using a Mac? Does your keyboard have USB out?

The bottom line is that what you want to do can be done but before I give you "simple details on how" you need to confirm for me that you can actually connect and play you keyboard in BIAB? If you can connect keyboard to the PC, then look to verify if BIAB sees the Keyboard (see picture for connection of my SL88 Keyboard (which by the way connects directly from Keyboard USB my PC USB cable)?

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BIAB – 2026, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud.