I was under the assumption you wanted them to select a team and then team members. What I now think you want is to have your data limited by who is running the report (logged in user) and only show them their team members.
I have not had to do this but others have. I believe it is highly dependent on your report deployment procedure and security set up.
Likely it would also have to use a Stored Proc (or an equivalent) to pull data so that you can pass the paramater at report run time but I am not sure.
If I the above is what you are looking for try reposting asking specifically about lmiting the data (which includes dynamic params) at run time based on the logged in user and include your system set up.
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