One Warehouse Manager assigned to One Warehouse only

Hi. guys..

I am facing one problem.

my requirement is that I want to assign one warehouse manager to one warehouse only.

lets say.. I have four warehouses named 'Bonded' , 'Steel', 'Paint' and 'Pipe'.

in the same way , I have defined four users as four warehouse manager named 'warehouse manager 1', 'warehouse manager 2', 'wareho'use manager 3' and 'warehouse manager 4'.

please let me know how to map this .

regards

aditi