For a List Variable

1. Go to "Test variables"
2. Pick a List variable
3. Click on the settings icon next to the name of the variable
4. Identify the lines of the table which correspond to the values you want to ignore
5. Match the value(s) you want to ignore under the column "Ignore modality"
6. Validate with the "Confirm" button

For a Yes-no variable

As only 2 values are possible for a Yes-no variable, you can not ignore either one or the other.

However, you can consider NC values as Yes or No.

For a Numeric variable

You need to filter the patients you do not want to include in the analysis by using the filter function.