How would I set up three financial companies - 100, 101 and 102 - in ERP LN so that I can create separate Balance and P&L reports for 101 and 102, and a consolidated report for both 101 and 102 in company 100? Company 100 is essentially a holding company for consolidated reporting with no AR/AP or cash management, only the occassional journal entry. I suppose I make 100 the group company (correct me if I'm wrong). Which tables should be shared? Thanks for your help in advance.

Recommended table sharing is well documented in Baan help . Mainly master such as client,supplier , company data , ledger , dimension , mcs data and ledger history table need to be shared . For more specifics baan documentation is quite helpful.

If multi-company setup creates / introduces any difficulty in your desired functionality, cosnolidation can still be done in reporting very easily and is not a big problem.