Help with Cascading More Than 2 Level Autocomplete in Data Grid

Following the helpful tutorials by Beth Massi and others(trust me, I've read them all), I was able to get partially there with autocomplete filtering.
I have gotten this to work on two dropdown levels but that's it. There is no tutorial that really touches deeper relationships than two. Here is the basics.
Customer Table
Locations(Customer can have many)
Order Table
Trip Table (Order can have many) (Trip must have a Location)
(Customer can have multiple addresses. Trips can be entered in the order as delivery routes)
To enter a trip, I need to select Customer type(CustomerTable), which does filters the customer.
CustomerName(CustomerTable) is selected, and it does filter Locations(LocationsTable).
(The automatically created autcomplete box in the screen for Locations by default I believe just shows the first item in the table which happens to be Address, so I don't even know if I'm filtering properly in the end to go any further.)
I am fine until here. after the Address(Location) is selected, I need to display the city field, and zip field. I have tried every which way but Sunday and can't figure out the required Query and bindings.
I am new to much of this so sorry if I shorted any details, if I can provide anything further for some insight please let me know.
MUST........UNDERSTAND.......QUERIES! :-)

Images are always helpful.
So Type is a choice list in the Customer table.
Customers is an automatically created relational autocomplete box.
Location is an automatically created relational autocomplete box.
City Result should be the city of selected Location...
I have tried binding Id, and also City as a parameter string to the Location query but no luck...I feel like I'm missing something really dumb!

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