Remove Topic Property by the use of Smart Rules

While a rule can be used to add or change a numeric topic property, this change isn't permanent and occurs only while the rule is active and applies to the topic.

For example, you could set up the rule to add a numeric topic property called "Estimate" with a value of, say, 250, when a topic has the Kanban To Do tag applied to it. If you are in the Kanban or tag view and you drag a topic to the To Do column, the Estimate property will appear with the value of 250, and if the topic already has a Estimate property with a different value, this will also be overridden with the value of 250.

However, if the rule is turned off or the topic is moved to another Kanban column, the Estimate property will revert to its original value, or, if the Estimate property wasn't added to the topic in the first place, it will disappear completely.