Comparing product structures > Understanding product structure (BOM) comparisons > Choose a comparison mode
Choose a comparison mode
You can compare product structures in one or more of the following standard modes, depending on the setting of the BOMCompareVisibleModes user preference: Single-level mode comparisons compare only the first level of the product structures. You can choose to include one of find numbers, substitutes, or reference designators in the comparison or exclude them. To use this mode, set the preference to IMAN_bcm_single_level or IMAN_lbcm_single_level_occ (the second setting is for occurrence-based comparisons of logical BOMs. Multilevel mode comparisons perform a single-level comparison at the top level of the structure. Teamcenter may then make further single-level sequential comparisons of any subassemblies that appear in the two product structures. You can choose to include find numbers in the comparison or exclude them. To use this mode, set the preference to IMAN_bcm_single_level_seq. Lowest level mode compares only the lowest level items of the product structures, ignoring all intermediate assemblies. To use this mode, set the preference to IMAN_bcm_lowest_level. Variable level comparisons of the product structure, where the level in the current comparison is selected by the user. To use this mode, set the preference to IMAN_bcm_var_level or IMAN_bcm_var_level_seq, depending on whether you want to include just the current level or also further sequential comparisons of any subassemblies. The modes listed above are available if the BOMCompareVisibleModes preference remains set to its default values. The following non-default modes are available if you edit the preference value: Comparison of all levels of the BOM, if the preference setting includes IMAN_bcm_every_level.
Caution If you use this mode with very large BOMs, performance may be adversely affected. Comparison of the lowest level items, with sequential comparisons of any subassemblies, if the preference setting includes IMAN_bcm_lowest_level_seq. Externally initiated variable level comparisons of the product structure if the preference setting includes IMAN_bcm_ext_var_level or IMAN_bcm_ext_var_level_seq. Item-based comparisons of logical BOMs if the preference setting includes IMAN_lbcm_var_level (variable level comparisons) or IMAN_lbcm_lowest_level (lowest level comparisons). Occurrence-based comparisons of logical BOMs if the preference setting includes IMAN_lbcm_var_level (variable level comparisons) or IMAN_lbcm_single_level (single level comparisons). Your Teamcenter administrator may define custom comparison modes appropriate for your site. If they are added to the BOMCompareVisibleModes preference, they also appear as available modes in the BOM Compare dialog box.
Source: https://docs.sw.siemens.com/documentation/external/PL20251212545240207/en-US/tc_help/pse/xzq1737253370295/ljb1737253370394/ksc1737253370626/comp_compare_modes.html · retrieved Sat Jul 11 2026 00:00:00 GMT+0000 (Coordinated Universal Time)