Maintain versions of ThingWorx entities on platform

Hi,

As part of the development we are creating some entities on thingworx platform and releasing them to the internal test team. 

As the development is in progress and we continuously modify and add new entities we would like to maintain entity versions for each release on the thingworx platfrom. So the question is how to band entities to a specific version? How to define versions on thingworx entities so that we can differentiate them based on release?