if/then conditions in test cases?

Is there a way to create if/then conditionals inside a test case?  For instance, can I do something like the following:

if OS_TYPE == Windows then

     do this test step or part of a test step.

else if OS_TYPE == Mac then

     do something else.

When I execute this test case I would set the OS_TYPE parameter to whatever type of operating system I was running.  SpiraTeam would then only show me the test step that was appropriate.

Is there a way to do this?  Or, is something like this planned for the future?  Thank you.