Can you substitue tomato sauce for crushed tomatoes?

Yes, definitely but you may want to add extra seasoning such as salt, pepper, oregano, mushrooms, garlic, and onions and more to achieve the correct taste

Yes, you can in most recipes. I would actually recommend it...it is a much healthier choice!

Yes you can, however the taste will change from the original intent as crushed tomatoes do not contain the spices/herbs normally included in a can of stewed tomatoes. carefully read the ingredients...

Yes, especially if your cooking the tomatoes in as once they are cooked you will not see a differance.

I do this all the time and I put the paste in a pan, add water or wine, stir it until I get the right thickness, keep adding the water/wine until it is right, add any spices I want, a tablespoon of...