Task delegation functionality(User role based work delegation functionality)

Hi,

we have to implement user role based work delegation functionality,

like we are having multiple Role into our application so now based on that if user want to their work to another  user or role.

so how we can achieve this into Mendix or Mendix provide this kind of functionality? 

please suggest if some one have any idea about this.

OR

Hi, How can i allow users to delegate their tasks for certain Duration,

For, A user went for Leave, He needs to Delegate his tasks to other user? How can Achive this in Mendix 6.7.1

thanks

Mandeep