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Basically what it says above. Related to my last one a bit. How you do it? Links to tutorials would be nice or someone that would be kind enough to walk through it with me.
This post is too vague to give much meaningful advice.
As far as creating more free space in existing banks, this is completely a case-by-case problem.
As far as expanding the rom, assuming you are using the disassemblies, you can simply create new ROMX sections and place them in new banks.