Rack number from global table

Hi,
I am having two racks in my model. The racks are connected as follows
Source>>racks>>queue. I am using global table to load or unload flow items into racks (specified bay and level). My problem is how to identify the racks based on number mentioned in global table to direct the flow items into corresponding rack. Thanks in advance.

What about using the port connections? In the sendto simply look up in the global table what port to use.

Or if you want to be more advanced, use a treenode array global variable