I think we should follow the 3D disc. We do this for the other data, so an exception here would be confusing. The extended info will be on the 2D child, so we are still tracking it.

What I was thinking of was multiple on the same disk. "For branching titles, or those with multiple versions (e.g. Theatrical and Director's Cut) on the same disc, use the longest running time.  Exception: If the longer version is available only as part of an Easter Egg, use the shorter running time."

So, I would revise my vote and say, if you make the parent 3D, then use the 3D details. Use the extended length and DVD details (Such as audio tracks) on the DVD child disk.

Unlike run time, there is no specific requirement that the different versions be on the same disc for the rating.  The rule simply states:

For localities which offer it as a choice, enter "Unrated" for DVDs which: Contain an alternate version of a film which received a theatrical rating, and which have no rating or are marked "NR" or "Not Rated"

If a set is released as an 'Unrated' edition, because the child profiles are optional, that is the rating the set should receive.

Quoting Ace_of_Sevens:

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The rule on this says

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Sets containing the same film on multiple media types (such as a Blu-ray/DVD combo pack) are to be entered as a normal profile for the main media type (Blu-ray in this example)

It's been since established that the 3D Blu-ray is the main media type in these sets.

While that may be true, it does not trump the rating rule.

Let's take the example that prompted my 'no' vote, which in turn prompted you to PM me asking me to add my opinion to this thread, which I am now regretting: The Wolverine: Unleashed Extended Edition.

It is sold as an unrated, extended edition so should have an NR rating in the only profile that is required.

I feel I should also point out the fact that it has also been established that 3D is not a media type at all, there is no '3D Blu-ray' media check box, so what we really have here are two Blu-rays with different 'video formats'. 

Quoting AiAustria:

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I don't see how the rating fits into this thread, but especially on this point the box set rules are quite clear and simple:

Why would the box set rules apply to a combo pack?

Quoting AiAustria:

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Why would the box set rules apply to a combo pack?

Because it is a boxset. The fact, that the children are optional, does not affect the fact, that it is a box set.

In perfect data base layout we would not call this linkage "box set", but we would be able to name this relation on a case per case base: combo pack, collection, season, series, ...

No offense intended, but please help me understand your view.  Combo packs are releases of the same film on different media, formats, or discs (i.e. UHD Blu-ray, Blu-ray, HD-DVD, DVD, Digital, 3D, etc.) versus box sets which include different films either on the same or different discs in a given release.

As far as I understand the rules, these are treated the same as a normal profile instead of a box set although as you stated the optional child profiles can be added to the normal profile under the box set section.

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Sets containing the same film on multiple media types (such as a Blu-ray/DVD combo pack) are to be entered as a normal profile for the main media type (Blu-ray in this example), with all included media types checked. A combo which includes HD media (HD-DVD, Blu-ray) as well as DVD should use the details from the HD media in the main profile. However, you may add an additional profile by Disc ID for the DVD content and add this profile to the Box Set contents for the Blu-ray profile.

Are we taking about two different things here?

Quoting TheMadMartian:

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I feel I should also point out the fact that it has also been established that 3D is not a media type at all, there is no '3D Blu-ray' media check box, so what we really have here are two Blu-rays with different 'video formats'. 

It's been established that we treat them as such in this instance. That's the whole reason we are applying combo pack rules and Ken had to treat these 3D sets as combo packs.