Why would you want to do such a thing? Perhaps to reorganize elements, move to a different DTD, adapt content or restructure for a different purpose?
To transform or repurpose DITA XML with DITA2Go requires two steps:
You can name the formats directly after elements, either input or output elements, if that makes sense for your conversion. Conserving elements that do not require reworking is very simple: map unaffected elements to formats of the same name. However, you also have the flexibility to do much more when a clear element-to-element mapping will not suffice.
The only other way to rework DITA XML is to use XSLT, which for anything non-trivial requires serious programming skills.