You can create reusable or non-reusable metadata extensions. You associate reusable metadata extensions with

all

repository objects of a certain type. So, when you create a reusable extension for a mapping, it is available for all mappings. Vendor-defined metadata extensions are always reusable.

Non-reusable extensions are associated with a single repository object. Therefore, if you edit a target and create a non-reusable extension for it, that extension is available for the target you edit. It is not available for other targets.

You can promote a non-reusable metadata extension to reusable, but you cannot change a reusable metadata extension to non-reusable.

You can create, edit, and delete user-defined metadata extensions using the following tools: