I am new to Jira and I have taken over managing existing projects in Jira from someone else. I'm not sure how the projects were created but I noticed I was able to add the "Original Estimate" field to Project A by going into "Project settings"-->"Issue Type" and drag "Original Estimate" from the bottom right to the "Context" section. However for Project B when I follow the same path, there is no "Original Estimate" field to drag over. When I go to "Issues"-->"Customer fields"-->"Create Custom" field and create "Original Estimate" using the "Number field" and associate with the respective screens, I am still not able to see the field. Can you provide guidance?