Can't think if any obvious reasons why it wouldn't work. So you'd need to have the action setup as one that runs every time a Day record is saved. That action would be an "Execute a sequence..." action which firstly updates the parent record if all Day[Status]="Finish". Then step two of the action would be to do either a LINKTOFORM(), LINKTOVIEW() or LINKTOROW() action.
Two things to bear in mind. Build each part of the bot in stages, testing each stage. With the LINKTOFORM(), LINKTOVIEW() or LINKTOROW() bit create this initially as a visble button so you can test it.
Also note that if you're using slices or views there maybe multiple Form views of the day record form view. Keep an eye under the app preview to see which view you are currently in.
Simon, 1minManager.com
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