Can you use one electrical panel to pull circuits to another electrical panel. I don't think this can be done but cannot find it in the code book. Example ( One panel is closer to run pipe to then pull the wire though to the other panel).
As Bob pointed out the code section 312.8. I think too many people don't read the entire section and this is what has given rise to the common myth that you can't splice in or use a panel enclosure as a raceway.