At Associate/Senior Associate level, it is very easy to try projects across different sectors - in fact, it is encouraged at PwC.The ease that you can switch sector teams on a permanent basis depends on the level that you join - the more junior you are, the easier it is.However, you should expect to spend at least 1 year being 'assigned' to a given sector team. After that, providing you have done the appropriate networking, it should be reasonably easy to make a switch