By bootable, you mean something that will continue the process of starting the system (no info here; computer, etc.) once the BIOS or hardware check is completed?
Tell more.
What do you want to boot?
What operating system?
Using an USB flash or storage drive?
What media would be used to install the bootable partition? Where would you get it?
Lot of questions, no information. Only guesses. Guesses don't work.
How do I create a Bootable jump drive?

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