There is an easy way to create a non-reusable object in Informatica PowerCenter out of a reusable one. This is specially useful when you want to change some settings of the session, so instead of copying the existing one you can drag the non-reusable session directly to workflow and edit the settings there.
A reusable object has the green “cycle” icon in the left corner:
Notice that a non-reusable session doesn’t have that icon:
How to create the non-reusable session out of a reusable one?
Drag a session (or other object) and just before you drop it in the Designer area hold the CTRL key.
When you’ll hold the CTRL key you can notice that the cursor changed and now has a small ‘+’ icon. Now you can release the object and you’ll get a non-reusable one.