Mastermind includes NPC classes for minions.
Simply click on the "NPC class" button located next to the "Level" adjustment and the NPC class settings will appear on the right.
Type in the name of the NPC class you want to use and (if you spell it right) the cost will be filled in automatically. These numbers are acquired from the names of the .npc files in the NPCClass sub directory of Mastermind so what you type in must match the name of the .npc file (without regard to capitalization)
Or hit the "P" button for a list of the presets (from the books).
.npc files can be made with NPC Class builder (included)
As shown above the book and page appear below the stats and costs are calculated appropriately, and the class names are filled in the "type" box
Clicking on a clear button will clear that class and all below it.
When finished, simply click on the < button or the "NPC class" button or "set.." ability scores