At the moment, only one group can own an Objective. The Key Results and Initiatives that belong to that Objective, however, can be owned by members of any team. That means that the Objective can be owned by team A, but its Key Results are owned by members of team B.
Alternatively, you could create a new Group exclusively for the two teams who will be sharing the OKR (for example Sales-Product), and add the members of both teams to it. In Perdoo, a user can be a member of multiple groups.
You can then select this group as the Owner, and the goal will be visible on the shared Group's page.
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