1. An information processing apparatus, comprising: a first memory storing computer-readable instructions; and one or more processors configured to execute the computer-readable instructions such that the one or more processors are configured to perform operations including, reading, from the first memory, a model common function file defining one or more common functions that are common to a majority of a plurality of models of image forming apparatuses stored in the memory and one or more setting items corresponding to the common function, and reading at least one model specific function file defining a function specific to a selected one of the plurality of models of the image forming apparatus and setting items corresponding to the model specific function; combining the model common function file with the model specific function file to generate a combined function file; and selecting, among the setting items of the function defined in the model specific function file, one or more settings items each setting item having two or more unselectable values, and overwriting the selected setting items in the combined function file with corresponding setting items defined in the model common function file.