All suspended items, be it a product, service or a category, continue to remain in the system's database and is hidden from active items. If you need to recall the item, you simply have to reactivate it.
To reactivate a suspended category:
Step 1: Go to the Products tab and select Manage Category.
Step 2: The Categories list will appear. Click More and select Show Suspended. The suspended category will appear highlighted in red.
Step 3: Select the Category and change the status from Suspended to Active and click Save.