1. To insert a static value into your target field, enter the value in the Value field. This field usually has a numeric value because you typically target a line’s quantity or price.
2. To insert the result of a formula into your target field, enter the formula in the Formula field. You can construct a formula using Salesforce operators and functions. You can also add information from the quote or the target object field (for example, SBQQ__QuoteLine__c.SBQQ__ListPrice__c).
3. To insert a value from another quote line field on your quote, enter the field’s API name in the Source Field field.
4. To insert a value from a summary variable, enter the lookup to that variable in the Source Variable field.
5. To insert a value from a lookup query, select the field for the Source Lookup Field.