Factory Calender Problem in BI system

Hello Friends,

I have One BI system for that 5 source systems were connected .

In Our case Every plant use a "custom" Calendar like ZJ, Z5, ZI with different source systems.

All these "custom" calendars are not defined in a single source system, so when we make the Transfer of Factory Calendars we need to use the option "Rebuild tables" (the only option that works) that deletes all custom calendars from previous transferred other source system.

Then my question: is there any way to "add" (without deleting) these custom calendars to BI from all source systems ? (in order BI has all "custom" calendars)

If no, what's the solution to this problem?

Appreciate your answers.

Regards,

Gautam