This N4 rule is not used in CodeOne.
This rule is from the annex to the Infinity N4 ruleset, containing a series of rules, special skills, weapons and pieces of equipment which have been adapted to the N4 system, but with a provisional nature. Rules included here are completely official, however they may be modified in further expansions of the N4 ruleset.
The Infinity Fireteams rule allows players to activate a team of Troopers who support a single Team Leader, with less Order expenditure. There are several types of Fireteams.
As a quick summary: This rule allows the activation of groups composed of 2 to 5 models by consuming a single Order. These models must be in Coherency with a Team Leader, and while they may not shoot or act directly against the enemy. Instead, they provide a bonus to the Leader, who carries out the Order. Fireteam leadership can alternate between its members; players can change the Leader when they declare a new Order.