Well you made your question easy to read. Why use preformatted markdown for the text of your question? Preformatted markdown is intended for code blocks.
In the top right corner of the forum pages, there is a magnifying glass. Selecting this allows you to search the forums for questions that have been asked and, in most cases, answered.
A search for “dropdown” as one of the main keywords in your question returns:
Set dropdown condition to string returns no match
Dropdown Conditions: Multiple values for both the Choices and the returned values
A search for “reference column filtering” returns:
How to use CHOICE reference filter with Reference List?
lookupRecords filtering a Reference List column does not work
Have you tried using any of these as references to accomplish your task?
I hate to be “that guy” but, seriously,
I tried using the Dropdown condition, but couldn’t get it to work.”
What did you try? What was the result?