Ability to compare a result to the premium or other field in the rules

We often ask for a Target Premium but there is currently no way to refer a case by rule if the target is not met.  

In the rules you are able to refer by entering a set amount, for example:

Condition=  Get Answer:  <Target Premium>: Greater Than:  <enter a value>

But it would be great if you could do something like:

Condition=  Get Answer: <Target Premium>: Greater Than:  <TotalPremium>

(Where in <TotalPremium> you can select a premium or field).

Target premium is just the example I have in mind but obviously this can be used for other fields.  For example, if Turnover is less than wageroll then refer......