New keybinding on 2nd keyboard

Hello guys

As all my keyboard keys are occupied… I want to add more 40 to 50 shortcut keys… I have attached another keyboard… But i donno how to create new keybindings for that keyboard

Means i want to execute ctrl+alt+a key combination when i press “a” on 2nd keyboard

Please if you have any odea then let me know… It would be a big help

Regards
Pratik