export/import PI interfaces

Hi,

what all are the possibilities to import/export all interfaces from one company SAP PI system to another company PI system. let me explain you the background: if XYZ company acquires ABC company, XYZ has to install new PI system and get all the interfaces from ABC company; what is the best way to approach this?

NOTE: very few interfaces, not using CTS+ for migration

Thank you in advance.

Prema