Here are instructions from the ALM (QC) 11.53 Administration Guide:
Adding User-Defined Fields
You can customize an ALM project by adding up to 99 user-defined fields to each ALM entity.
Cross Project Customization: The template project and linked projects can each contain up to 99 user-defined fields for each ALM entity. ALM Editions: Cross project customization is not available for Quality Center Enterprise Edition.
To add a user-defined field:
- In the Project Customization window, in the left pane, click Project Entities. The Project Entities page opens.
- Under Project Entities, expand an entity.
- Click the User Fields folder.
- To add a user-defined field, you can:
- Click the New Field button to add a number, string, date, or list type field.
- Click the New Field arrow and choose New Memo Field to add a memo field. You can add up to 5 memo fields to each ALM entity.
Note: In Site Administration's Site Configuration tab, you can extend the number of memo fields you can add, by editing the EXTENDED_MEMO_FIELDS parameter.
- In the Settings tab, set properties for the field. For more information, see Customizing Project Entities.
- Click Save to save your changes to the Project Entities page.