"negative" entries, fitness apps

Good morning!  I'm still pretty new to Carbmanager, so there may be features I haven't found yet, but it would be nice to be able to enter "negative" items.  For example, if you make a recipe that includes an ingredient you don't like or have, you could enter a negative for to remove it from your total.  Also, it would be nice if Endomondo could be linked to your account, but definitely not a big deal since the exercise database seems to be pretty detailed.  If the ability to enter negative carbs/protein/fat exists, please let me know.  Thanks for an awesome way to track the Keto lifestyle!