This window allows you to Link or Unlink units together.
Go to the Tenant -> Link/Unlink.
Often a tenant will rent more than one unit at the facility. In such a case, you might have his units linked so that the tenant can pay rent for all of their units with a single payment.
Once you have opened this window you can choose if you want to link or unlink units. If you want to link units select any number of units from the left hand side of the window and click the ? Add button. If you wish to remove any of these, select the units from the right hand side of the window and click the ? Remove button.
When you are finished editing this window click the OK button.