Link to customized picklist fields

Summary:

We have 2 customized picklist fields in our Requisition. We want the 2nd picklist to be linked to the first, i.e. if we select for example A in Field 1, Field 2 will only display A.1, A.2 values. Whatever we select in Field 1 will determine the values that will display in Field 2. I dont think this is possible thru setup/config, but is this possible for development? Thanks

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