If a mix included in the recipe is selected, the selling prices of the mix (if set) will be displayed beside its costs in the ingredient cost list panel. You cannot edit the costs of a mix, since they are calculated from its ingredients costs, nor you can assign a cost to the mix if it has a selling price set (through the command Get cost into recipe).
If a selling price is inputted it will replace the cost of the mix in the recipe screen (although the cost will be kept in memory); zeroing a selling price will result in re-setting the formula cost for the mix in the recipe screen.
Although mixes cannot be included in user lists, they can have Working group, farm or user list costs or selling prices; the formula costs are always calculated from their ingredients costs, while selling prices can be directly inputted in the recipe screen or in the costs list of the ingredient (pop-up Feed costs).
It is possible to edit the ingredients costs of a mix created in the recipe. Open the mix with the + button: a list of the mix ingredients with their costs will be displayed. After editing a cost in this list, the formula cost of the mix will be recalculated. The cost origin of the edited ingredient cost will be the one displayed in the combo of the recipe.
If a user list is selected as cost origin of the recipe, it is possible to set, for a certain ingredient of the mix, a different cost origin like a farm or group. The costs of an ingredient mix can be displayed in a separate panel by right-clicking on the ingredient cost (in the opened mix) and selecting the command Feed costs. From the costs panel, it is possible to edit and/or select one of the costs in the usual way.