IFS Business Planning Consolidation Structure

Hello,

I’m trying to create an IFS Business Planning structure with multiple entities.

We have numerous companies, each with different reporting currencies.

I would like to create a planning unit for each company. (e.g., plan in local currency for each company, and consolidated to reporting currency USD)

How do I best structure this? 
1) Do I create a planning unit in each company? or
2) Do I create planning units in one company and link them to the Business Plan? (But can’t import General ledger from each company)

Any help is appreciated.

Thank you!