Custom Kernel Compiling

[Prasad Ram]

Hi i am new to Linux Kernel
I am using ubuntu 12.04. Recently i downloaded the latest kernel 3.15-rc3
and build it using this tutorial
<http://kernelnewbies.org/KernelBuild>.Even though i am successfully
boot that kernel i would like to know how to
choose  other kernels which are already installed on your system to boot.

And how to create kernel image by using sources which are inside /usr/src/
in your system.

Thank you .
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