Security Groups -- User in Multple Groups

Hi ,

I have a team hierarchy with multiple Teams are working fine.[ Team data will be seen by all users in the Group ]
I have an Executive who works for 2 Teams – I had added Executive to Team-2 all Team 1 data is visible to Team-2 – how to restrict data only to particular user[ he should see Team 1 and Team 2 data – Not rest of team-2 users]