Hi nowellk, From our experience from R12 migration, there's no tool available embedded in the solution for that (I have to admit that I find that weird, but...)CA Services proposed us to use a tool specially designed for that, that is called Liberty if I'm not wrong, but that would need some re-design, and as it's already not free, re-design it would make it expensive.
So we decided to make our own development using XPS Tools of R12SP2 and Perl, but it may be tricky because CA discovered all operations available in these tools are not working properly (especially on upates).
Hope it can help you a bit.