Allow for survey branching

By this I mean based on the questions in the current survey the user is directed

For example I am working on a very convoluted survey convoluted because the result of one question changes the survey dramatically ( ihave decided to split it into multiple surveys with a hack at the front to select which one the user goes to.

It would be a nicety that a survey can be branched into sub surveys based on conditions

This could be a non question question type called an 'Action' where the conditions decide what action the question type takes

so say for a yes no questions