To further clarify, whenever you create an issue, you are brought to the create issue overlay. Choosing the project allows you to have different form fields depending on which project is selected.
I was wondering if it is possible to create another field besides the project, that would allow for custom field entries as well. Basically is it possible to create another field that has the power to change the fields underneath?
I need this because we are currently using the "project" field as the team the work falls under. I can't change that one because it all needs to fall under the same team.
I'm not sure if my "project" dropdown is someone else's "X."
It is the screen mapped to the selected issue type that controls what fields you see when creating an issue (via screen schemes which are associated with the project). Have a look at this, https://confluence.atlassian.com/adminjiraserver075/project-screens-schemes-and-fields-935391216.html
You could use a custom field to control what is being displayed on a screen, but then you need an app like Scriptrunner, Power Scripts or others that allow you to do scripting.
To echo Mikael's response, you could re-architect your single project to have multiple contexts in the form of issue types. Then you can control what is shown on the screen for each issue type.
If you want to go down the Power Scripts route, you could have a field, for example, called "Context" that the user can select. And based on that selection you could hide or show fields using the Live Fields feature with routines like lfHide() and lfShow().
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