You can use script runner plugin to fetch the value and then update the custom field
ProjectCategory getProjectCategoryForProject(Project project)
//Test para Console
def issueKey = "IESD-14862"
def issueManager = ComponentAccessor.getIssueManager()
def issue = issueManager.getIssueObject(issueKey)
//def issue = issue as Issue
log.info("issue: "+ issue)
def projectManager = ComponentAccessor.getProjectManager()
def project = projectManager.getProjectCategoryForProject(issue.getProjectObject())
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