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Can a prompt be referenced from an external table? Example: Table A has $prompt1 and then references Table B (external) that uses this prompt to determine its results?
Yes, when you include an external table that's in a different file, its loaded and inserted into the current generator file. So every table is treated as if its in the same file.
That said, if you intend to use this external table in other generators, you might want to assign a prompt value to a variable first, and reference the variable in the external table. Because you don't know if what that external table will need will always be in $prompt1. It might be $prompt2 in another generator that uses the table.