Setting Up Agile Planner → Configuration → Attributes Setup → Attributes → Flag
A flag attribute (or field) is used to indicate yes/no data, such as whether a work item is billable (Billable), whether a document or a project is checked in (Is Checked In), whether a team member has assigned themself to a task (Self Assigned), or whether a task has been made visible across projects (Task Externally Visible).
Add a new attribute. From the Type drop-down, select flag.