Official rule text
67.1 Each unit that a player can produce has a cost value presented on its faction sheet or technology card. To produce a unit, a During the “Production” step of a tactical action, the active player player must spend a number of resources equal to or greater can resolve the “Production” ability of each of their units that are in than the cost value of the unit they are producing. the active system to produce units. a Spent resources must come from planets or trade goods that 68.1 A unit’s “Production” ability, which is presented on a faction are controlled by the player who is producing the units. sheet or unit upgrade technology card, is always followed by a value. This value is the maximum number of units that this unit b Any resources spent in excess of a unit’s cost are lost. can produce. c If a player is producing multiple units at a time, that player a If the active player has multiple units in the active system can add the cost of each unit they are producing to create a that have the “Production” ability, that player can produce total cost before they spend any resources. a number of units up to the combined total of their units’