No, I don't believe that your exercise calories burned are subtracted from your caloric intake.
The basic premise of the exercise diary is that your body needs energy to just function - so you can set, for instance, how many hours you sleep, rest, etc. Then what you do is add the length of time you did any exercise (and possibly the intensity - see the walking section - it has walking at 2, 3.5 and 4mph if I remember correctly) and you reduce that from your "sitting" rate.
Sorry - this is hard to explain - you just have to keep poking around with it. It's been a while since I set up mine - but for weekdays, I put down the half hour I'm in the car to/from work, the 7.5 hours I'm doing what they term as "desk work", 8 hours of sleep and then to make up the rest of a 24-hour day, added resting and sitting time.
Then whenever I do any aerobic exercise, I generally choose the type and how long I did it and then indicate that it should be "instead" of the time I have set for, say, "resting". The time for the actual exercise is then reduced from the resting time with the amount of calories burned - based on what the site knows my weight is.
Your weight makes a difference because it takes more energy for a 300 lb person to do something for 15 minutes, as opposed to a 150 lb person doing the same activity for the same amount of time. Of course, this means, as we lose weight, we will either have to up the intensity and/or the length of time to generate the same amount of calories burned as we did when we were heavier. Hope this helps! Joyce
**Edit 2/13: I paid a little closer attention to the diet calendar this morning - FS will
subtract our exercise calories from the calories we've eaten to give the "net" calories for that day - I stand corrected. :- ) J
"Diet" is a four-letter word.
"You don't have to see the whole staircase. Just take the first step." Martin Luther King, Jr.