I am working in some clinical trails application, my requirement is  doctors will take samples (skin specimen, blood, etc...) and  they will keep those in physical location  and they want to do the same in system.

Storage locations are freezer or tower etc based on the sample type.  Admin will create the Freezer/Tower by giving the name and each has its own configuration like each freezer will have 16 racks in that and each rack will have 12 boxes & each box can have 81 positions to save the specimens.  So when user wants to choose location to save the specimen

1. we need to list the freezers available with information freezer id/name specimen count and available positions(have the information in db) with one color

2. User will select/clicks on one freezer then a pop-up or any need to display 16 racks with information(id/name and filled/available count)

3. Then he will choose one Rack and then box ....

Please help me which type of controls (selectable grid) are helpful for this 

Thanks,

Praveen Palla.