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The formation provides a restriction, as it's states what may be included. It does jot allow other units to be added.

nosferatu1001 wrote:
The formation provides a restriction, as it's states what may be included. It does jot allow other units to be added.

You'll see my response to this earlier in the thread. Formations show what units you must take, as long as you have those units, the restriction is met. Requiring certain units is not the same as banning all others

This formation is composed of: x, y, z is an exhaustive list if what the formation can, and must, contain.

Your reply earlier assumed this was not an exhaustive list, and that you can alter a formation and for it to still be the same formation. Neither is true

nosferatu1001 wrote:
This formation is composed of: x, y, z is an exhaustive list if what the formation can, and must, contain.

Your reply earlier assumed this was not an exhaustive list, and that you can alter a formation and for it to still be the same formation. Neither is true

You assume it is exhaustive, where does it say it is?

It is your assumption that it is not, so show me where it states you can add Army List Entries which are not listed as part of the Formation to said Formation.
Keep in mind, permission to simply add something to a Detachment is General while an Army List Entries on what can be included in the Formation is specific, so permission to add to the Formation has to be just as specific.

Lets say I take a standard CAD of orks

I take 2 painboys as the HQ, then I take 2 slotless meks that are allowed because of the painboys.

the meks may not take up a slot, but they are part of that formation as the unlocking of the meks comes from that formation. This is explained in the rulebook under "Army list entries that do not use force organization slots" The mek would gain any benefits of the detachment(formation) it was purchased for.

HQ choice refers to the battlefield role. It is shown in the mek entry that the mek is a HQ battlefield role by the HQ battlefield role symbol in its army entry.

NORMALLY your HQs are independent characters and can join whatever unit is allowed to have characters attached to it. however the unit would only gain the benefits from the (detachment/formation) it was part of. This could lead to weird situations where your HQ has some rules for its detachment, and the unit does not gain those rules but has its own rules for its detachment that the HQ does not get. recordkeeping :(

Meks are an exception to the above, as per their rules. They must join a unit from their detachment and may not leave it for the entire battle.

in regards to being able to take a detachment and then put the slotless "unlocks" in another detachment the answer is absolutely no per the RAW.

If the Army List Entry states that it can be included in an army that includes another specified unit, and that it does not take up a Force Organisation slot, it must join the same Detachment as that specified unit.

using the above and orks for example.

if I buy a CAD and have 2 painboys as HQ [which allows for 2 slotless mek unlocks] as per the rules above if the entry does not take up a force organization slot [the meks] and their is a requirement to buy them [the hq slot unlocks mek slot] they must join the same detachment as the specified unit that unlocks them. so they cannot be part of a different detachment.

How do you take HQ choices in a detachment without HQ choices?

On a similar note but at a slight tangent, are we allowed to (in-game) make an independent character (from one detachment) join a unit from a formation?
My example is this: can a Painboy from my Combined Arms Detachment (that has been deployed either on his own or as a part of a unit from this detachment) leave his unit on Turn 1 and then join a unit of Boyz that is in the Ork Warband Formation?
Any insight would be much appreciated.

You may, as long as the Formation is a Battle-brother.
This is covered by the Battle-Brother Sub-Section of the Allies Section.

Despite the word formation there is no general rule requiring the models purchased in a formation to be grouped in some way, or to exclude other models from joining them. Some specific formations have specific rules in their formation for this, or for benefits they receive if parts of the formation stay together.

That stated you could start a painboy from a CAD or whatever detachment, joined to a unit from a different formation than the painboy was purchased for just as you can have an IC in your army join any unit in your army at the start of the game generally.

or if you really wanted you could have a painboy join the unit turn 1, not sure if you can leave a unit and join another unit the same turn, don't have my rulebook on me at the moment.

Although in our minds we see the word formation and associate with a specific way things are grouped, it is meant as a way things are purchased in 40k, sometimes these purchased things require you to stay together but they have to state such things in their specific formation entry.

Additionally there is nothing generally preventing an IC from a formation for being put into a unit from a different detachment at the start of the game or joining them later in the game.

of course specific formation entries like "green tide" would prevent the greentide warboss from joining another unit as it has to stay in the greentide unit, but you could add a painboy to it from a different CAD.

Highly Recommend doing so.
Nothing like giving Feel No Pain to more then a hundred Models!

JinxDragon wrote:
Highly Recommend doing so.
Nothing like giving Feel No Pain to more then a hundred Models!

I'd consider Grotsnik to give them fearless too, add a Big Mek with KFF to cover your most exposed flank, baby, you got a stew goin!

KFF now only covers the models in the 6", might actually need two