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I am in the process of evaluating OmniGraffle /-pro.

I am quite frustrated in creating a diagram for my PHD-thesis:

It syeems not to be possible to create diagram items, linked to each other BUT not in a hierarchical connection. Is it really not possible to link to boxes WITHOUT them being Parent-Child?
What do I want to do:

To create a diagram of a company Siemens:

Top-level: Siemens & Halske -- Siemens-Schuckertwerke (both on the same level, NOT in hierarchical relationship. There is NO further Parent-entity/Box/above-level (I know that there are "partner-nodes"; but this seems not to work here)

next level: Three daughter companies, simultaniously owned/controlled by BOTH the top-level firms.