I used tomato sauce during induction - I just watched my portions carefully. I also use Hunt's brand as that is the one I can find with no sugar added (I can't believe how many brands have sugar in them!!). It is a bit tricky to say how many "cups" of veggies 1/2c of tomato sauce would count as, since it is "cooked down" tomatoes...I'd estimate 1/2c tomato sauce = at least 1c "veggies".
Go ahead & have your enchiladas
Tomato sauce is good for you - there is nothing wrong with carbs from veggies (as long as you stay under your daily limit of course!)
Good plan to deal with your craving BTW, this is a great substitute for something that you love and isn't "legal" on this rung of Atkins. I've "Atkinized" quite a few of my favorite recipes...works great
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Julie__________________F/37/5'2"__________________Start April 15, 2009
Milestones:ozers6p4
240 - University grad weight - Met July 29, 2009
213 - 50% of the way to goal - Met October 21, 2009
Onederland - Met December 23rd, 2009 
180 - High School grad weight
163 - No longer obese______
136 - No longer overweight (yes, I know this is lower than my goal weight)
Left-Apr/09 Right-Dec/09