The contents of the IMM dialog box are controlled by the file, rmdt_imm_params.txt. You will find this file in the <installation_dir>/text/mold_data directory. This file contains the descriptions of the IMM models and their parameters. The data within this file is organized per assembly model. That is, there is an entry for each model that will be retrieved using this dialog box.

Make sure that the first line of an IMM description is labeled ASSEMBLY, followed by the name of the assembly file that represents the IMM. Make sure the next line is labeled NAME, followed by the name that will be listed in the dialog box. If the IMM is from a family table, add an additional line labeled FT_INSTANCE, followed by the name of the instance. When creating an entry for a instance of a generic model, give the ASSEMBLY the name of the generic assembly.