SAP Data Services - business rules reusability

Hi guys,

What is your aproach with SAP Data Services when you want to reuse business logic?

For instance, let's imagine you have 4 data sources (finance, hr, business and R&D). If you want to apply a global rule like creating multiple fields (X, Y and Z) to this 4 datasets how do you do it?

Do you simply copy paste components between data flows and remap the new fields, or do you try to use any kind of framework?

Thank you