A challenge: relating on the fly two entities created separately

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Hi all!

I have stumbled on the following business requirement, and don't quite know how to solve it. I have some ideas but always seem to stumble on something half way through.

1. We have a Custom Object A, which is a child of an OSvC incident. Instances of these objects are created by one set of users as part of their normal workflow in an OPA interview.
2. We then have a Custom Object B, which is also a child of an OSvC incident. Instances of these are created in a different interview, by a different set of users at a different time.