Add list "type" with separate dictionary for each type.

I have a list defined for each store "type" and would like to keep a separate dictionary for each type.  For example, store types "grocery", "hardware", "music", "pharmacy", and "sporting goods."  It is not useful to have items across these different types of stores in the same dictionary.  For example dictionary items 'bacon', 'banjo strings', 'bolts 1/4-20 x 2"', 'cereal - corn flakes', 'circuit breaker 20A', etc.  I am using two character prefixes in the dictionary to keep items grouped by store but this is very inconvenient.  Allow the user to define a "type" when the list is created and associate a dictionary with each "type."