Loading Multiple Time-Dependent Characteristics for an InfoObject

I want to load 2 time-dependent characteristics for the InfoObject CO Order. Getting the from_dates and to_dates for the changes to any one characteristic is somewhat complex, but manageable. Adding additional logic to merge the two sets of from_dates and to_dates is something I would prefer to avoid.

Is there a way that I can load each of these time-dependent characteristics independently, and let BW handle the merging of their from_dates and to_dates to get the various combinations of characteristic A, characteristic B, from_date, and to_date?

e.g. I feed BW: Order 1, Characteristic A value 2 from 1/1/05 to 3/1/05. I separately feed BW: Order 1, Characteristic B value 1 from 12/1/05 to 2/10/05. BW automatically derives the entry Order 1, Characteristic A value 2, Characteristic B value 1, from 1/1/05 to 2/10/05.

Also, is it possible to load the time dependent characteristics of the InfoObject independently of the non-time-dependent characteristics, from a separate datasource and infosource? If so, how?