In the MCAT dimensions and IRTmodel a list of values should be written. An easier option would be a possibility to read the values from a txt file.
Right clicking the Dimensions in MCAT and Parameter in IRTmodel should open a file selection dialog where you can select a txt file to import the values.
The txt file should have the values as tab separated.

OR

in IRTmodel there could be a separate import button. Then you could import parameters from a file with the parameter name as the first value (Difficulty, Discriminant, Guess) and tab separated values following the parameter name.
The same logic with the MCAT and the Dimension name as the first vlaue.