You can use a bit of VBA for this. Go to the VBA IDE (alt-F11) and put this code in the module of the worksheet where you want to auto-populate the cells:
Then, on another worksheet, build a map like this:
Text containing 500A Text containing 600B
Text containing 500B Text containing 600D
and give it a name of NestMap.
When you change the target worksheet within the range of A2:A8, it will trigger the code to look for the value in the NamedRange with the map. If a match is found, it will change the row immediately below to the mapped value.
BTW, I would recommend you use a named range for your data validation map as well, over time it will work better than typing the validation entries directly into your data validation.
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