Perform action group multiple times with different variable values

I am doing a bunch of XDT transforms on a project that has 3 solution configurations: test, staging and live. At the moment for each transform I need 3 actions, one for each configuration.

What I would like to do is set up a dropdownlist variable and be able to iterate over the action group for each value in the variable and use it in the transform file field like this:

web.$configValue.config

and the target file:

~\Output$DeployableName$configValue_PublishedWebsites\Project.Web\web.config

I can't see any method to do this - have I missed something? I have quite a few transformations that need to be managed so this would help simply management of the application.

Product: BuildMaster
Version: 4.8.3

The current (v4) execution engine does not support Array-type variables, so this would not be possible using that technique. But we will soon (couple weeks) be shipping v4.9, which will include a brand new execution engine, that will include Array/Vector variables, so you could do something like ...

foreach $value in @MyVariableList {
    Transform-Config (...);
}