You can expand it in aura but this is done with affirmation. When you inhale energy(can be with color) and exhale into your Aura by affirming and programming your Aura.
But breathing in is just breathing in. And then you can program it there. That's just different method. The above one is faster one and more straight and is good for AoP or for generally programming you aura to attract something. But also constitutes as exercise in getting feeling and controlling the energy, and also it expands your aura.
Second one you first do all inhales then feel the energy and program and direct it this is more regular working.