can a workflow update the case (incident) activity?

[MichaelZischeck]

We use the Case management for our customers.

Upone adding a "parent" i'd like to mark the parent as "Problem case". 

This works just fine with a workflow. 

BUT: i'd like the Activities (especially Field changes) to be updated with the appropriate field change on the parent case.

How can I achieve this?

[MichaelZischeck · Accepted solution]

the solution was quite simple: 

in the normal GUI (not workspace) I can configure which fields are displayed in "field changes"... so I added the field in question (category) and voilà