Interest between Cases

Hi,

I need to setup interest between a trust and a company, in ver 3.7 I can do this easily, however, I am not sure on how to go about doing it in Nav 09.

Can anyone shed light on this? I need to test consolidation between companies, and I need to setup first my trust and companies to do this. I have 1 consolidation company (TOP) and 3 underlying companies that I need to link to my TOP or consolidation company before I can proceed.

Thanks!