How do you add fields to a JIRA ticket during the creation process?

[michael.tovar]

When creating a ticket, how can new default fields be added to the ticket?  I would like to add categories and sub-categories. 

[Mikael Sandberg]

Hi @michael.tovar,

Welcome to Atlassian Community!

You cannot dynamically add new fields to the screen when you create an issue. The fields that you see has to be added to the screen used for the create view. See Manage issue screens for more information. 

[Mikael Sandberg]

This is also a good page to check out to see how fields, screens, and schemes works together, Project screens, schemes and fields