When editing a lead, it would be great to be able to tag/associate it with an off market listing. As I go thru & update leads, sometimes the property?

When editing a lead, it would be great to be able to tag/associate it with an off market listing. As I go thru & update leads, sometimes the property they inquired about is now off market and I can only tag it to an active listing which throws off the stats for that property.