Create your standard axis, and then create an axis at your new origin. Now translate the part from the new origin to the standard axis. The translation is in the generative shape workbench.
Or right mouse click on your new origin axis and set as current.
A picture would help us to understand your problem better...and how is created a part (axis system origin) can be subject of a method specific for each company on how to model parts in CATIA...
It can be done also if you change the support (or coordinates for points) of what you want to be in Origin....