How To Create Multi-Select Bounded Picklist

I know that using a combination of the Indirect function and data validation I can essentially create a bounded picklist whereby the selection in cell A1 defines my options for selecting from a list of values in B1. This way if for instance you had a list of cities in every state with INDIRECT function used to link to a data validation list in Cell B1 and in Cell A1 you selected from the list of values "California", in B1 you would get a LOV displaying only cities in California.

I also found a neat little Macro to allow for selecting multiple values in a single cell while still using the data validation tool, see below:

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My question is how do I combine these two efforts to essentially allow me to do a multi-select from a data validation LOV, which then dynamically impacts the subsequent cells? So, if I have selected in A1 "California, Arizona" I would want to show cities in B1 from both states but no others.

I have attached my sample worksheet as well.

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