Here, see attached. In "Member - List" sheet multiple named ranges has been set up.
Headers contain name of each list. Note that Member List is set up only for Bukoto Group 01 as an example.
Attachment 495825
Data validation uses =Indirect($C2 & "CentreList") to dynamically look up which centre list to use based on area.
Similar set up are used in subsequent columns.
You'll find more detailed explanation in Contexture (I find it one of best resource for dependent drop down).
http://www.contextures.com/xlDataVal02.html
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