Flow simulation previous runs, boundary conditions

Hello,

I am using solidworks 2011 with a model that was given to me rather than drawn by me. I am trying to use the flow simulation add in to run some tests on my model but I am having some problems with the boundary conditions.

When ever I try to set inlet or outlet conditions I get an error message telling me that the face I have selected already belongs to another condition. So essentially my question is, how can I delete all exsisting boundary conditions so that I can start with a clean slate on this model? I assume whoever drew the model also ran some tests on it.

Thanks for any help,

Owen