Create a mksysb and SPOT using NIM

nim -o define -t mksysb -a server=master -a location=/export2/directory -a mk_image=yes -a source=power2 mk_mksysb_name

lsnim -l mk_mksysb_name 

nim -o define -t spot -a source=mk_mksysb_name -a server=master -a location=/export2/SPOT/directory/ SPOT_Name

lsnim -l SPOT_Name 

Reference: 

http://aixdoc.wordpress.com/?s=nim 

SPOT is responsible for 

- Creating a boot image to send to the client machine over the network.

- Running the commands needed to install the NIM client.