Portfolio automatic assignment based on custom field

[Estelle Bardon]

We assign our task to an assignee. An Assignee belongs to a custom field "workstream". In Portfolio, there is the option to see reports by team (which is the equivalent of our workstream). However, the automatic assignment mixes team members and teams. 

Is there an automatic assignment of assignees to teams that works?

Thank you

[Krista Parker]

I'm confused, are you using a custom field of assignee instead of the system field of assignee?