In this case, we called it - Related Task. To create a related task field, you can create a custom field named Related Task in Task Form Field and choose the field type as URL. Note that each field can only store one URL, so you will need to create more Related Task fields if you have more than one task to refer to. To insert the related task, you will need the Task URL. Task URL can be obtained in the Created By section in the Task Conversation Panel. The above instructions are stated from a staff's perspective. If you are using the default task form, kindly note that every custom field will be shown on the default task form. Make the Related Task field optional if it should be visible to the users, or add the Related Task field as a staff-only field if it is only for internal management. Custom task fields feature is available for Level 2 subscription only. If you are having Level 1 subscription and wish to have this feature without upgrading your subscription, contact us for more information.