2-D data sets for the front and side views can not be used with MODFLOW. Data sets used in MODFLOW will always have a value for each cell. Geometrically, a MODFLOW cell is equivalent to a PHAST element.
For data sets in MODFLOW models for which parameters have been defined, the values of the data set will be determined by the parameters rather than the formula for the object. For such data sets, the phrase "(defined by parameters)" will appear after the name of the data set and the user will not be able to assign values for the data set directly. If the grid is colored with such a data set, ModelMuse will generate a formula that will mimic how the data set values are assigned by MODFLOW.