Add a lookup matrix
A lookup matrix serves as a source for logic-based calculations in lookup matrix type calculated fields.
To add a logic-based calculated field to an item, you must first add the lookup matrix and give it a name. Adding an optional description defines how the lookup matrix is used in calculated fields.
To configure a lookup matrix, you must select a pick list for the matrix columns, rows, and results.
To add a lookup matrix:
- Create pick lists for the calculation inputs (matrix rows and matrix columns) and the calculation results (matrix values): - Select Lookup matrix as the pick list type.  
- (Optional) To change the table color from default gray, select a row in the Pick list values table, select Edit values, and select a color.  
 
- Select ADMIN > Organization > Lookup matrices.  
- Select Add lookup matrix.  
- Enter a name and optional description for the lookup matrix. 
- Configure the lookup matrix settings: - Under Matrix Configurations, use the drop-down selectors to configure the matrix columns, rows, and values/result. 
- Select Generate matrix, then select matrix values for each matrix cell according to the logic-based calculation outcomes you need. - For example, when the P-total field has a value of High and the Severity field has a value of Low, the calculated field for Risk Score returns the result Tolerable in orange.  
 
- Select Save & done. 
- Select from an existing item type or add a new item type, then select Add field. 
- Confirm that the calculation input fields were added to the item: make sure the pick lists match the configuration pick lists used for the calculation lookup matrix source you want. 
- In the Add field window that opens, select Lookup matrix as the calculation type. - Select from an existing lookup matrix as the calculation source, then select from available fields as calculation inputs.  
- Select Save. 
The lookup matrix is now available for use in logic-based calculations.