Ability to assign tree harvesters to mine/harvester towers

Basically make Mine Control Towers - Mine/Harvester Towers. I frequently want to have some tree harvesters clear one area and another group of harvesters clear another completely different area. I would be great to be able to assign tree harvesters to mine/harvester towers - like excavators to mine towers.

Hi I Would like to say this is one addon that the game needs.
I hate having to move my tree harvester from this area to that then back just so i can fit a building.
The idea of being able to clear several areas at once would be fantastic.
regards
Trevor