To edit automatic load combination rules

On the Model ribbon tab, select the Automatic Combinations tool in the Loads group.

The Automatic Combinations dialog opens.
Click Manage Rules. The Automatic Load Combination Manager window opens.
Note: By default, all the tables and configurations in the manager are read-only until unlocked for editing.

To add new custom codes or custom tables to an existing code:

Add a…	Select the …
custom code	Codes and tables entry in the Contents panel and then select the Code tool
custom table to the current code	Code name in the Contents panel and then select the Table tool

To change the code configuration settings:
1. In the Contents panel, navigate to and double-click on the code configuration title.
1. Click the Unlock table updating tool in the Edit group on the Home ribbon tab.
2. Check the Notional Load checkbox for any load types you want to consider as notional loads.
3. Select the Combination Type for each load type:
  - Aggregate - combine all cases of this type together into a single load combinations
  - Separate - a separate combination is generated for each load case of the given category (for example, three Seismic load types would generate three different load combinations when set to this option)
  - Matrix - all possible combinations are generated for each load case of the given category, including aggregate and separate methods (for example, three Seismic load types in X, Y, and Z would generate seven different load combinations: X only, Y, only, Z only, X & Y, Y & Z, X & Z, and X Y & Z)
4. Repeat steps 4b and 4c for other load types as needed.
5. Click the Commit tool in the Edit group on the Home ribbon tab.
To change combination rules for a combination table:
1. In the Contents panel, navigate to and double-click on the code table you want to edit.
2. Click the Unlock table updating tool in the Edit group on the Home ribbon tab.
3. Add a new row in the table using the tools in the ribbon. Each row represents a load combination.
4. Double-click in any cell to assign a load factor to that load type for the combination. Cells with a value of zero are shaded gray.
5. Repeat steps 5c and 5d to add or edit rows as necessary.
6. Click the Commit tool in the Edit group on the Home ribbon tab.
Click the Lock table updating in the Edit group on the Home ribbon tab to stop editing the current table or configuration page.

Tip: You can reset tables or all changes to made using the Reset to Default and Reset In-Build Codes tools.