How to configure and set a default view for contents of a data set

Question

Here is my scenario:
I have a document library where each item is a "Plan".  "Plan" is of a custom content type that inherits from a Document Set content type but has some additional attributes such as Plan Type.  Inside each Plan, each item is
a Plan Document which is of custom content type Plan Document which inherits from Document content type but has some additional attributes e.g. Document Status.
So the hierarchy is:
All Plans (document library)
     Plan 1  (custom content type that inherits from Document Set but also has a "Plan Type" attribute)
             Plan Document   (custom content type that inherits from Document but also has a "Document Status" attribute
When I click on the document library, I want to see all the folders (e.g. Plan 1) where one of the columns will be "Plan Type"
When I click on an individual Plan (e.g. Plan 1) I want to see the contents of that custom document set.  At this point, since this page shows contents of one document set, I want to see the column "Document Status" but NOT Plan Type since
Plan Type applies to the document set as a whole, not to an individual item in that document set.
However, I don't think I have it set up correctly because right now the "Plan Type" column is visible both on the list of all document sets AND on the page that shows the contents of one document set.
I've found a discussion on this topic here:
http://sharepoint.stackexchange.com/questions/61565/how-can-i-set-a-custom-default-view-for-a-document-set
where one person said "When you click on a Document Set content type in library settings, one of the options is "Document Set settings". The last option in this dialogue allows you to select a defined view on the library that will be used
to show the contents of that Document Set."  I don't see that view selection.  The last item on the document set settings page is "Update List and Site Content Types".  The field before that is for customizing the Welcome page. 
However, I don't want to customize the Welcome Page as a whole, I just want to customize the columns that are displayed on the list of content of this document set.
thanks

Answer 1

I finally found the answer:
At the document library level, create a new view to use when displaying the files in the document set
Go to the document library settings
Select your custom content type (in my case it was "Plan")
In the next screen select Document Set settings
Select your newly created view at the Welcome Page View section
Press Ok
Now the default All Documents view will be shown when displaying all the document sets and the newly created view will be displayed when viewing one document set with the files within.