You can manually deactivate any offer in your Seller Office. 

You must go to inventory then click on the right side of the offer that shows Offer History. After, click on the three dots at the end of the line; there you can deactivate an offer so that it is no longer visible or purchasable. 

You can also deactivate your offers via the Open API.

If you connect with an open API you must deactivate through the software partner you are using. 

Please note: Offers that are in the ordering process can no longer be changed to the current order.