For product that are temporary no longer in use, you can disable the product instead of removing them. This allow you to enable it back in the future.
Login to backend
Go to items>item center>product information
Click on edit on selected product, uncheck the is enabled column and press save.
For multiple products to disable:
Go to items>item center>mass update
Click on enable/disable item.
Check the product that will be disable
Click on batch setting
Click on the blue enable selected item to change it to grey deactivate selected item.
Click on confirm
To activate back the product
Click on advanced search and select disable at item status.
This allow you to see and select the disabled items.
Repeat the way you disable the items, except you keep the status to activate this time.