Is there any way to make Select List (single choice) custom filed conditional ?
I know we can do it for Free Text Field (unlimited text
https://confluence.atlassian.com/jirakb/how-to-display-a-field-based-on-another-field-s-selection-649921383.html
Your fastest/easiest option is to use one of the plugins available for workflows, check out Misc Workflow Extensions among others.
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