Upload Hr Information

  Hi,

In my work they are creating 2 new societys, because the old two were configured wrong and the have to been closed. In the old 2 societys there are a big historical Hr information, ahd the don't want to use the 'cross hr information' option that oracle give us, the want to migrate all the information to the new societys. I want to upload the information using HP APIS.

The case is for example, there is a employee that started as applicant, then he became to a employee, then an ex-employee, then he returned, but in that period of time, he had different assignments, contracts, etc. My question is, to upload the information? Can i do it module by module (person, contract, assignment) or i have to do it in base of effective_dates?