The default configuration for Ketryx's traceability matrix can be found in the project advanced settings (click the question icon next to 'traceability configuration').

 

In this default, columns of the trace matrix draw traceability based on defined "relations". For example, in the default v3 configuration, the designOutput column is configured to draw traceability based on relations to items in the designInput column.

 

 

To establish traceability to a different column, e.g. UseCase, you'll need to add another bit of "relations" JSON to the "designOutput" column. We recommend adding this below the existing relation as they're executed in priority order - this way Ketryx will first read relations to designInput and then useCase.
 
To make this configuration adjustment like this, we would copy the full v3 traceability configuration and add bit of additional JSON, below the existing "relations" for the column we want to expand traceability for - in this case designOutput.

,{
"kind": "direct",
"relationType": "FULFILLS" ,
"referencedColumnId": "useCase"
}