Can I change the lifecycle phase on an obsoleted item?

You can change the lifecycle phase on an obsoleted item from update 23A onward. Here's how:

In the Product Development work area, assign the item to a change order. On the Affected Objects tab, use the New Lifecycle Phase column.

In the Product Information Management work area, use the item page or a change order for a commercial item. On the item click Actions > Change Lifecycle Phase.