Sometimes single configuration item needed to be imported.

Follow below steps to achieve this.

Investigate the item type and item name of needed item

Example: ShopFloorWorkbench Client Configuration got deleted

Download the backed-up ACP

From files locate the correct item like below

 

Now go to Application Configuration Package/s → Import
Select import configuration
 

Now select the item file identified above

 

Using this way is much safer than importing a bundled ACP.