Impact on replication into CAR when ECC is refreshed ?

Hi,

I am using SLT to replicate data from SAP FMS (SAP Fashion Management Solution, similar to ECC)  to SAP CAR. 

We are currently in the implemention phase and the replication is working fine.

I now want to refresh FMS system and bring in a cleaner and larger set of master data. But I do not want to rebuild CAR !!

I want to know how I can replicate the new data into CAR without rebuilding CAR ? Detailing some steps would be helpful ..

For instance, should I

1. First stop SLT replication

2. Showdown CAR

3. Refresh FMS

4. Reconfigure .. SLT

5...delete SAP_ECC Schema from CAR..

On a similar note, after we go live with the solution, we would be refreshing Quality Environment from productions occasionally to get master and transactional data. I want to know how should this scenario be handled ?

Regards,

Dheeraj