Workarea ownership issue

System

Teamsite 5.5.2.

I have 2 workareas in different branches that are both shared with the group "IWOps". How can I change the group for sharing of one to a different group?

I thought iwidmap would help, but a group extract shows the following entry for IWOps
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a user extract shows the following entry for IWOps
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I don't know a lot about iwidmap, but it appears that a TOKEN maps a SID to all workareas shared by that SID. If that's the case then how, without recreating the workarea, do I change one without changing the other?