Re: PO 7.5 migration best approach

HI Neelima,

Please check the below posts which talks about Migration -

13 Reasons to Migrate from SAP PI to SAP PO (and Intelligent Business Operations) – Chalk and Cheese – Key for S/4 HANA

Decision Making Factors when Moving to SAP NetWeaver Process Integration 7.3 - Upgrade or New Installation with Phase-ou…

For PO -

You will have to configure Interfaces for Proxy and IDoc based on Single stack methodlogy.

EDI - You will have to check feasibility of using B2B addon

I think it will not matter if you do in cycles or you do at once.

Also check below thread for reference.

PI 7.1 to PO 7.41 migration

Hope this helps -

Thanks

Ninad Sane