Evaluate parameters of request set at the execution of a phase

We have a request set with many stages in a sequential execution. Actually, all the parameters for each stage are evaluated at the launch of the request set. Is it possible to make that the parameters are evaluated at the execution of the phase rather than the global request set.

Example, we need to execute few Journal Import in the request set. Each execution of it is defined as a stage. When we excute the first Import, it takes a group id.  The next execution, it should take the next group id, and so on.  But when we launch the request set, it sets all the group id at the same value.