"If you are using the battle-forged method, you will instead need to organise the Imperial Knight models in your collection into Detachments such as the Household Detachment and the Oathsworn Detachment shown here. This is a fun process in its own right.
Note that you can also include any of the Formations present in this section as a part of a Battle-forged army."
Can I take a Household Detachment (3-5 Knights) that consists of the Exalted Court(5 Knights)?
The Pinkertons advanced on the Salamander line, breaking through to the Company Command. The Salamander Captain accompanied by his Ancient and his Apothecary, leading a detachment of Devastators, bringing no less than 16 Lascannons and Missile Launchers to bare on the Renegade Knights. Further support for the Loyalists found itself in a Predator Annihilator and a blessed Knight Porphyrion.
As the smoke of the advance cleared, the Acheron came around a guard tower to find the Porphyrion arm