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Moving a part of existing "On-Premise ECC" to "SAP S/4 HANA Cloud"

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We have a Production ECC System which is on EHP7 Non-Unicode.

It has 2 Production Work Clients - Clients A and B.

Client-A of it is being used for HR and GCS. 

Client-B is being used for Plant Maintenance, Finance and Quality Mgmt.

We are looking on the Option to move a part of one of the "Client-A only i.e. GCS to SAP S/4 HANA Cloud" whereas others will still be on On-Premise itself.

Please help with the possible Options/approaches in moving with this scenario from On-Premise ECC to SAP S/4 HANA Cloud without disturbing the others.




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Considering all steps involved, my recommendation is to start a greenfield instead of a migration/conversion.

To move the CGS to the cloud, you will need this (still on premises):
 1. create a copy of the source system (as a sandbox)
 2. Remove the client-B on the new sandbox (t-code SCC5)
 3. Remove all data related to the HR module (you will advanced HR consultants to do this)
 4. Execute the conversion using DMO of Software Update Manager (SUM).

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Thanks Mamartins for the suggestion. 

Reg the conversion, this we can try for sandbox. But, how can we try this in the actual prod environment without affecting the business?