"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)?